diff --git a/build_files/buildbot/slave_compile.py b/build_files/buildbot/slave_compile.py
index 0e264a752d51..d99e66f78717 100644
--- a/build_files/buildbot/slave_compile.py
+++ b/build_files/buildbot/slave_compile.py
@@ -112,8 +112,8 @@ def parse_header_file(filename, define):
             chroot_name = 'buildbot_' + deb_name + '_i686'
             cuda_chroot_name = 'buildbot_' + deb_name + '_x86_64'
             targets = ['player', 'blender', 'cuda']
-        cmake_extra_options.extend(["-DCMAKE_C_COMPILER=/usr/bin/gcc-6",
-                                    "-DCMAKE_CXX_COMPILER=/usr/bin/g++-6"])
+        cmake_extra_options.extend(["-DCMAKE_C_COMPILER=/usr/bin/gcc-7",
+                                    "-DCMAKE_CXX_COMPILER=/usr/bin/g++-7"])
 
     cmake_options.append("-C" + os.path.join(blender_dir, cmake_config_file))
 
diff --git a/doc/python_api/sphinx_doc_gen.py b/doc/python_api/sphinx_doc_gen.py
index 3b0e8f52c83e..7ad3bab1557e 100644
--- a/doc/python_api/sphinx_doc_gen.py
+++ b/doc/python_api/sphinx_doc_gen.py
@@ -1639,6 +1639,11 @@ def write_sphinx_conf_py(basepath):
     fw("version = '%s - API'\n" % BLENDER_VERSION_DOTS)
     fw("release = '%s - API'\n" % BLENDER_VERSION_DOTS)
 
+    # Quiet file not in table-of-contents warnings.
+    fw("exclude_patterns = [\n")
+    fw("    'include__bmesh.rst',\n")
+    fw("]\n\n")
+
     if ARGS.sphinx_theme != 'default':
         fw("html_theme = '%s'\n" % ARGS.sphinx_theme)
 
@@ -1659,6 +1664,24 @@ def write_sphinx_conf_py(basepath):
     fw("}\n\n")
 
     fw("latex_documents = [ ('contents', 'contents.tex', 'Blender Index', 'Blender Foundation', 'manual'), ]\n")
+
+    # Workaround for useless links leading to compile errors
+    # See https://github.com/sphinx-doc/sphinx/issues/3866
+    fw(r"""
+from sphinx.domains.python import PythonDomain
+
+class PatchedPythonDomain(PythonDomain):
+    def resolve_xref(self, env, fromdocname, builder, typ, target, node, contnode):
+        if 'refspecific' in node:
+            del node['refspecific']
+        return super(PatchedPythonDomain, self).resolve_xref(
+            env, fromdocname, builder, typ, target, node, contnode)
+
+def setup(sphinx):
+    sphinx.override_domain(PatchedPythonDomain)
+""")
+    # end workaround
+
     file.close()
 
 
@@ -1697,9 +1720,6 @@ def write_rst_contents(basepath):
         for info, info_desc in INFO_DOCS:
             fw("   %s <%s>\n\n" % (info_desc, info))
         fw("\n")
-        fw("- :ref:`Blender/Python Add-on Tutorial: a step by step guide on")
-        fw(" how to write an add-on from scratch <blender_manual:advanced_scripting_addon_tutorial>`\n")
-        fw("\n")
 
     fw(title_string("Application Modules", "=", double=True))
     fw(".. toctree::\n")
diff --git a/intern/cycles/kernel/kernel_accumulate.h b/intern/cycles/kernel/kernel_accumulate.h
index 175bd6b9737d..9ed16aceb55d 100644
--- a/intern/cycles/kernel/kernel_accumulate.h
+++ b/intern/cycles/kernel/kernel_accumulate.h
@@ -220,7 +220,9 @@ ccl_device_inline void path_radiance_init(PathRadiance *L, int use_light_pass)
 #ifdef __SHADOW_TRICKS__
 	L->path_total = make_float3(0.0f, 0.0f, 0.0f);
 	L->path_total_shaded = make_float3(0.0f, 0.0f, 0.0f);
-	L->shadow_color = make_float3(0.0f, 0.0f, 0.0f);
+	L->shadow_background_color = make_float3(0.0f, 0.0f, 0.0f);
+	L->shadow_radiance_sum = make_float3(0.0f, 0.0f, 0.0f);
+	L->shadow_throughput = 0.0f;
 #endif
 
 #ifdef __DENOISING_FEATURES__
@@ -680,11 +682,12 @@ ccl_device_inline float3 path_radiance_sum_shadowcatcher(KernelGlobals *kg,
 	const float shadow = path_radiance_sum_shadow(L);
 	float3 L_sum;
 	if(kernel_data.background.transparent) {
-		*alpha = 1.0f-shadow;
-		L_sum = make_float3(0.0f, 0.0f, 0.0f);
+		*alpha = 1.0f - L->shadow_throughput * shadow;
+		L_sum = L->shadow_radiance_sum;
 	}
 	else {
-		L_sum = L->shadow_color * shadow;
+		L_sum = L->shadow_background_color * L->shadow_throughput * shadow +
+		        L->shadow_radiance_sum;
 	}
 	return L_sum;
 }
diff --git a/intern/cycles/kernel/kernel_path.h b/intern/cycles/kernel/kernel_path.h
index fc093ad83194..c340b3bc9685 100644
--- a/intern/cycles/kernel/kernel_path.h
+++ b/intern/cycles/kernel/kernel_path.h
@@ -643,11 +643,16 @@ ccl_device_inline float kernel_path_integrate(KernelGlobals *kg,
 #ifdef __SHADOW_TRICKS__
 		if((sd.object_flag & SD_OBJECT_SHADOW_CATCHER)) {
 			if(state.flag & PATH_RAY_CAMERA) {
-				state.flag |= (PATH_RAY_SHADOW_CATCHER | PATH_RAY_SHADOW_CATCHER_ONLY | PATH_RAY_STORE_SHADOW_INFO);
+				state.flag |= (PATH_RAY_SHADOW_CATCHER |
+				               PATH_RAY_SHADOW_CATCHER_ONLY |
+				               PATH_RAY_STORE_SHADOW_INFO);
 				state.catcher_object = sd.object;
 				if(!kernel_data.background.transparent) {
-					L->shadow_color = indirect_background(kg, &emission_sd, &state, &ray);
+					L->shadow_background_color =
+					        indirect_background(kg, &emission_sd, &state, &ray);
 				}
+				L->shadow_radiance_sum = path_radiance_clamp_and_sum(kg, L);
+				L->shadow_throughput = average(throughput);
 			}
 		}
 		else {
diff --git a/intern/cycles/kernel/kernel_path_branched.h b/intern/cycles/kernel/kernel_path_branched.h
index 10816d3e5d1f..77d4f1df4472 100644
--- a/intern/cycles/kernel/kernel_path_branched.h
+++ b/intern/cycles/kernel/kernel_path_branched.h
@@ -499,13 +499,16 @@ ccl_device float kernel_branched_path_integrate(KernelGlobals *kg,
 
 #ifdef __SHADOW_TRICKS__
 		if((sd.object_flag & SD_OBJECT_SHADOW_CATCHER)) {
-			if(state.flag & PATH_RAY_CAMERA) {
-				state.flag |= (PATH_RAY_SHADOW_CATCHER | PATH_RAY_SHADOW_CATCHER_ONLY | PATH_RAY_STORE_SHADOW_INFO);
-				state.catcher_object = sd.object;
-				if(!kernel_data.background.transparent) {
-					L->shadow_color = indirect_background(kg, &emission_sd, &state, &ray);
-				}
+			state.flag |= (PATH_RAY_SHADOW_CATCHER |
+			               PATH_RAY_SHADOW_CATCHER_ONLY |
+			               PATH_RAY_STORE_SHADOW_INFO);
+			state.catcher_object = sd.object;
+			if(!kernel_data.background.transparent) {
+				L->shadow_background_color =
+				        indirect_background(kg, &emission_sd, &state, &ray);
 			}
+			L->shadow_radiance_sum = path_radiance_clamp_and_sum(kg, L);
+			L->shadow_throughput = average(throughput);
 		}
 		else {
 			state.flag &= ~PATH_RAY_SHADOW_CATCHER_ONLY;
diff --git a/intern/cycles/kernel/kernel_types.h b/intern/cycles/kernel/kernel_types.h
index 34affab1b9d0..37af98b32c7a 100644
--- a/intern/cycles/kernel/kernel_types.h
+++ b/intern/cycles/kernel/kernel_types.h
@@ -515,7 +515,13 @@ typedef ccl_addr_space struct PathRadiance {
 	float3 path_total_shaded;
 
 	/* Color of the background on which shadow is alpha-overed. */
-	float3 shadow_color;
+	float3 shadow_background_color;
+
+	/* Path radiance sum and throughput at the moment when ray hits shadow
+	 * catcher object.
+	 */
+	float3 shadow_radiance_sum;
+	float shadow_throughput;
 #endif
 
 #ifdef __DENOISING_FEATURES__
diff --git a/intern/cycles/kernel/split/kernel_holdout_emission_blurring_pathtermination_ao.h b/intern/cycles/kernel/split/kernel_holdout_emission_blurring_pathtermination_ao.h
index 670a557f084d..fec671be0167 100644
--- a/intern/cycles/kernel/split/kernel_holdout_emission_blurring_pathtermination_ao.h
+++ b/intern/cycles/kernel/split/kernel_holdout_emission_blurring_pathtermination_ao.h
@@ -125,13 +125,21 @@ ccl_device void kernel_holdout_emission_blurring_pathtermination_ao(
 #ifdef __SHADOW_TRICKS__
 		if((sd->object_flag & SD_OBJECT_SHADOW_CATCHER)) {
 			if(state->flag & PATH_RAY_CAMERA) {
-				state->flag |= (PATH_RAY_SHADOW_CATCHER | PATH_RAY_SHADOW_CATCHER_ONLY | PATH_RAY_STORE_SHADOW_INFO);
+				PathRadiance *L = &kernel_split_state.path_radiance[ray_index];
+				state->flag |= (PATH_RAY_SHADOW_CATCHER |
+				                PATH_RAY_SHADOW_CATCHER_ONLY |
+				                PATH_RAY_STORE_SHADOW_INFO);
 				state->catcher_object = sd->object;
 				if(!kernel_data.background.transparent) {
-					PathRadiance *L = &kernel_split_state.path_radiance[ray_index];
 					ccl_global Ray *ray = &kernel_split_state.ray[ray_index];
-					L->shadow_color = indirect_background(kg, &kernel_split_state.sd_DL_shadow[ray_index], state, ray);
+					L->shadow_background_color = indirect_background(
+					        kg,
+					        &kernel_split_state.sd_DL_shadow[ray_index],
+					        state,
+					        ray);
 				}
+				L->shadow_radiance_sum = path_radiance_clamp_and_sum(kg, L);
+				L->shadow_throughput = average(throughput);
 			}
 		}
 		else {
diff --git a/source/blender/blenkernel/intern/editderivedmesh.c b/source/blender/blenkernel/intern/editderivedmesh.c
index a91983c001cd..ab614b8f4609 100644
--- a/source/blender/blenkernel/intern/editderivedmesh.c
+++ b/source/blender/blenkernel/intern/editderivedmesh.c
@@ -2641,7 +2641,7 @@ static void statvis_calc_distort(
 					              vertexCos[BM_elem_index_get(l_iter->next->v)]);
 				}
 				else {
-					BM_loop_calc_face_normal(l_iter, no_corner);
+					BM_loop_calc_face_normal_safe(l_iter, no_corner);
 				}
 				/* simple way to detect (what is most likely) concave */
 				if (dot_v3v3(f_no, no_corner) < 0.0f) {
diff --git a/source/blender/blenlib/intern/noise.c b/source/blender/blenlib/intern/noise.c
index 347640aae0d0..86c24307ae2f 100644
--- a/source/blender/blenlib/intern/noise.c
+++ b/source/blender/blenlib/intern/noise.c
@@ -1395,9 +1395,9 @@ static float voronoi_CrS(float x, float y, float z)
 static float cellNoiseU(float x, float y, float z)
 {
 	/* avoid precision issues on unit coordinates */
-	x = (x + 0.000001f)*0.999999f;
-	y = (y + 0.000001f)*0.999999f;
-	z = (z + 0.000001f)*0.999999f;
+	x = (x + 0.000001f)*1.00001f;
+	y = (y + 0.000001f)*1.00001f;
+	z = (z + 0.000001f)*1.00001f;
 
 	int xi = (int)(floor(x));
 	int yi = (int)(floor(y));
@@ -1417,9 +1417,9 @@ float cellNoise(float x, float y, float z)
 void cellNoiseV(float x, float y, float z, float ca[3])
 {
 	/* avoid precision issues on unit coordinates */
-	x = (x + 0.000001f)*0.999999f;
-	y = (y + 0.000001f)*0.999999f;
-	z = (z + 0.000001f)*0.999999f;
+	x = (x + 0.000001f)*1.00001f;
+	y = (y + 0.000001f)*1.00001f;
+	z = (z + 0.000001f)*1.00001f;
 
 	int xi = (int)(floor(x));
 	int yi = (int)(floor(y));
diff --git a/source/blender/bmesh/intern/bmesh_queries.c b/source/blender/bmesh/intern/bmesh_queries.c
index f5c14304ea33..668fb9982548 100644
--- a/source/blender/bmesh/intern/bmesh_queries.c
+++ b/source/blender/bmesh/intern/bmesh_queries.c
@@ -1511,12 +1511,11 @@ float BM_loop_calc_face_angle(const BMLoop *l)
  * Calculate the normal at this loop corner or fallback to the face normal on straight lines.
  *
  * \param l The loop to calculate the normal at
+ * \param epsilon: Value to avoid numeric errors (1e-5f works well).
  * \param r_normal Resulting normal
  */
-void BM_loop_calc_face_normal(const BMLoop *l, float r_normal[3])
+float BM_loop_calc_face_normal_safe_ex(const BMLoop *l, const float epsilon_sq, float r_normal[3])
 {
-#define FEPSILON 1e-5f
-
 	/* Note: we cannot use result of normal_tri_v3 here to detect colinear vectors (vertex on a straight line)
 	 * from zero value, because it does not normalize both vectors before making crossproduct.
 	 * Instead of adding two costly normalize computations, just check ourselves for colinear case. */
@@ -1525,20 +1524,55 @@ void BM_loop_calc_face_normal(const BMLoop *l, float r_normal[3])
 	sub_v3_v3v3(v1, l->prev->v->co, l->v->co);
 	sub_v3_v3v3(v2, l->next->v->co, l->v->co);
 
-	const float fac = (v2[0] == 0.0f) ? ((v2[1] == 0.0f) ? ((v2[2] == 0.0f) ? 0.0f : v1[2] / v2[2]) : v1[1] / v2[1]) : v1[0] / v2[0];
+	const float fac =
+	        ((v2[0] == 0.0f) ?
+	        ((v2[1] == 0.0f) ?
+	        ((v2[2] == 0.0f) ?  0.0f : v1[2] / v2[2]) : v1[1] / v2[1]) : v1[0] / v2[0]);
 
 	mul_v3_v3fl(v_tmp, v2, fac);
 	sub_v3_v3(v_tmp, v1);
-	if (fac != 0.0f && !is_zero_v3(v1) && len_manhattan_v3(v_tmp) > FEPSILON) {
+	if (fac != 0.0f && !is_zero_v3(v1) && len_squared_v3(v_tmp) > epsilon_sq) {
 		/* Not co-linear, we can compute crossproduct and normalize it into normal. */
 		cross_v3_v3v3(r_normal, v1, v2);
-		normalize_v3(r_normal);
+		return normalize_v3(r_normal);
 	}
 	else {
 		copy_v3_v3(r_normal, l->f->no);
+		return 0.0f;
 	}
+}
+
+/**
+ * #BM_loop_calc_face_normal_safe_ex with pre-defined sane epsilon.
+ *
+ * Since this doesn't scale baed on triangle size, fixed value works well.
+ */
+float BM_loop_calc_face_normal_safe(const BMLoop *l, float r_normal[3])
+{
+	return BM_loop_calc_face_normal_safe_ex(l, 1e-5f, r_normal);
+}
 
-#undef FEPSILON
+/**
+ * \brief BM_loop_calc_face_normal
+ *
+ * Calculate the normal at this loop corner or fallback to the face normal on straight lines.
+ *
+ * \param l The loop to calculate the normal at
+ * \param r_normal Resulting normal
+ * \return The length of the cross product (double the area).
+ */
+float BM_loop_calc_face_normal(const BMLoop *l, float r_normal[3])
+{
+	float v1[3], v2[3];
+	sub_v3_v3v3(v1, l->prev->v->co, l->v->co);
+	sub_v3_v3v3(v2, l->next->v->co, l->v->co);
+
+	cross_v3_v3v3(r_normal, v1, v2);
+	const float len = normalize_v3(r_normal);
+	if (UNLIKELY(len == 0.0f)) {
+		copy_v3_v3(r_normal, l->f->no);
+	}
+	return len;
 }
 
 /**
diff --git a/source/blender/bmesh/intern/bmesh_queries.h b/source/blender/bmesh/intern/bmesh_queries.h
index 903fdc59cb8d..83977fa8be03 100644
--- a/source/blender/bmesh/intern/bmesh_queries.h
+++ b/source/blender/bmesh/intern/bmesh_queries.h
@@ -113,7 +113,9 @@ BMLoop *BM_loop_find_prev_nodouble(BMLoop *l, BMLoop *l_stop, const float eps_sq
 BMLoop *BM_loop_find_next_nodouble(BMLoop *l, BMLoop *l_stop, const float eps_sq);
 
 float   BM_loop_calc_face_angle(const BMLoop *l) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL();
-void    BM_loop_calc_face_normal(const BMLoop *l, float r_normal[3]) ATTR_NONNULL();
+float   BM_loop_calc_face_normal(const BMLoop *l, float r_normal[3]) ATTR_NONNULL();
+float   BM_loop_calc_face_normal_safe(const BMLoop *l, float r_normal[3]) ATTR_NONNULL();
+float   BM_loop_calc_face_normal_safe_ex(const BMLoop *l, const float epsilon, float r_normal[3]) ATTR_NONNULL();
 void    BM_loop_calc_face_direction(const BMLoop *l, float r_normal[3]);
 void    BM_loop_calc_face_tangent(const BMLoop *l, float r_tangent[3]);
 
diff --git a/source/blender/bmesh/operators/bmo_primitive.c b/source/blender/bmesh/operators/bmo_primitive.c
index cca0f7387cd3..d8f83d786b46 100644
--- a/source/blender/bmesh/operators/bmo_primitive.c
+++ b/source/blender/bmesh/operators/bmo_primitive.c
@@ -839,7 +839,7 @@ void BM_mesh_calc_uvs_grid(
 	const float dx = 1.0f / (float)(x_segments - 1);
 	const float dy = 1.0f / (float)(y_segments - 1);
 	float x = 0.0f;
-	float y = 0.0f;
+	float y = dy;
 
 	int loop_index;
 
@@ -854,16 +854,16 @@ void BM_mesh_calc_uvs_grid(
 
 			switch (loop_index) {
 				case 0:
-					x += dx;
+					y -= dy;
 					break;
 				case 1:
-					y += dy;
+					x += dx;
 					break;
 				case 2:
-					x -= dx;
+					y += dy;
 					break;
 				case 3:
-					y -= dy;
+					x -= dx;
 					break;
 				default:
 					break;
diff --git a/source/blender/collada/AnimationExporter.cpp b/source/blender/collada/AnimationExporter.cpp
index 3bff20e846b1..b3d512204bea 100644
--- a/source/blender/collada/AnimationExporter.cpp
+++ b/source/blender/collada/AnimationExporter.cpp
@@ -530,7 +530,7 @@ void AnimationExporter::dae_baked_animation(std::vector<float> &fra, Object *ob_
 
 	addSampler(sampler);
 
-	std::string target = translate_id(bone_name) + "/transform";
+	std::string target = get_joint_id(bone, ob_arm) + "/transform";
 	addChannel(COLLADABU::URI(empty, sampler_id), target);
 
 	closeAnimation();
diff --git a/source/blender/editors/animation/anim_markers.c b/source/blender/editors/animation/anim_markers.c
index aafd7ebb1f96..be01f8cbe692 100644
--- a/source/blender/editors/animation/anim_markers.c
+++ b/source/blender/editors/animation/anim_markers.c
@@ -895,7 +895,7 @@ static int ed_marker_move_modal(bContext *C, wmOperator *op, const wmEvent *even
 			case PADENTER:
 			case LEFTMOUSE:
 			case MIDDLEMOUSE:
-				if (WM_modal_tweak_exit(event, mm->event_type)) {
+				if (WM_event_is_modal_tweak_exit(event, mm->event_type)) {
 					ed_marker_move_exit(C, op);
 					WM_event_add_notifier(C, NC_SCENE | ND_MARKERS, NULL);
 					WM_event_add_notifier(C, NC_ANIMATION | ND_MARKERS, NULL);
diff --git a/source/blender/editors/mesh/editmesh_select.c b/source/blender/editors/mesh/editmesh_select.c
index a6de1b284b79..68bd8ff27b1d 100644
--- a/source/blender/editors/mesh/editmesh_select.c
+++ b/source/blender/editors/mesh/editmesh_select.c
@@ -446,6 +446,9 @@ BMVert *EDBM_vert_find_nearest_ex(
 		unsigned int index;
 		BMVert *eve;
 		
+		/* No afterqueue (yet), so we check it now, otherwise the bm_xxxofs indices are bad. */
+		ED_view3d_backbuf_validate(vc);
+
 		index = ED_view3d_backbuf_sample_rect(
 		        vc, vc->mval, dist_px, bm_wireoffs, 0xFFFFFF, &dist_test);
 		eve = index ? BM_vert_at_index_find_or_table(bm, index - 1) : NULL;
@@ -630,7 +633,8 @@ BMEdge *EDBM_edge_find_nearest_ex(
 		float dist_test = 0.0f;
 		unsigned int index;
 		BMEdge *eed;
-		
+
+		/* No afterqueue (yet), so we check it now, otherwise the bm_xxxofs indices are bad. */
 		ED_view3d_backbuf_validate(vc);
 
 		index = ED_view3d_backbuf_sample_rect(vc, vc->mval, dist_px, bm_solidoffs, bm_wireoffs, &dist_test);
diff --git a/source/blender/editors/object/object_transform.c b/source/blender/editors/object/object_transform.c
index 4d7d7df0d2fa..47a3f79b0b4c 100644
--- a/source/blender/editors/object/object_transform.c
+++ b/source/blender/editors/object/object_transform.c
@@ -923,8 +923,8 @@ static int object_origin_set_exec(bContext *C, wmOperator *op)
 
 					cent[2] = 0.0f;
 
-					cu->xof = cu->xof - (cent[0] / cu->fsize);
-					cu->yof = cu->yof - (cent[1] / cu->fsize);
+					cu->xof = cu->xof - cent[0];
+					cu->yof = cu->yof - cent[1];
 
 					tot_change++;
 					cu->id.tag |= LIB_TAG_DOIT;
diff --git a/source/blender/editors/screen/screen_ops.c b/source/blender/editors/screen/screen_ops.c
index c99d9add4322..27e19ca1fc33 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -2260,25 +2260,28 @@ static int keyframe_jump_exec(bContext *C, wmOperator *op)
 	BLI_dlrbTree_linkedlist_sync(&keys);
 	
 	/* find matching keyframe in the right direction */
-	do {
-		if (next)
-			ak = (ActKeyColumn *)BLI_dlrbTree_search_next(&keys, compare_ak_cfraPtr, &cfra);
-		else
-			ak = (ActKeyColumn *)BLI_dlrbTree_search_prev(&keys, compare_ak_cfraPtr, &cfra);
-		
-		if (ak) {
-			if (CFRA != (int)ak->cfra) {
-				/* this changes the frame, so set the frame and we're done */
-				CFRA = (int)ak->cfra;
-				done = true;
+	if (next)
+		ak = (ActKeyColumn *)BLI_dlrbTree_search_next(&keys, compare_ak_cfraPtr, &cfra);
+	else
+		ak = (ActKeyColumn *)BLI_dlrbTree_search_prev(&keys, compare_ak_cfraPtr, &cfra);
+	
+	while ((ak != NULL) && (done == false)) {
+		if (CFRA != (int)ak->cfra) {
+			/* this changes the frame, so set the frame and we're done */
+			CFRA = (int)ak->cfra;
+			done = true;
+		}
+		else {
+			/* take another step... */
+			if (next) {
+				ak = ak->next;
 			}
 			else {
-				/* make this the new starting point for the search */
-				cfra = ak->cfra;
+				ak = ak->prev;
 			}
 		}
-	} while ((ak != NULL) && (done == false));
-
+	}
+	
 	/* free temp stuff */
 	BLI_dlrbTree_free(&keys);
 
diff --git a/source/blender/editors/sculpt_paint/paint_image_proj.c b/source/blender/editors/sculpt_paint/paint_image_proj.c
index d0f1cc99b8d9..b43581170d0f 100644
--- a/source/blender/editors/sculpt_paint/paint_image_proj.c
+++ b/source/blender/editors/sculpt_paint/paint_image_proj.c
@@ -3712,8 +3712,12 @@ static void project_paint_prepare_all_faces(
 				}
 
 				/* don't allow using the same inage for painting and stencilling */
-				if (slot->ima == ps->stencil_ima)
+				if (slot->ima == ps->stencil_ima) {
+					/* While this shouldn't be used, face-winding reads all polys.
+					 * It's less trouble to set all faces to valid UV's, avoiding NULL checks all over. */
+					ps->dm_mloopuv[lt->poly] = mloopuv_base;
 					continue;
+				}
 				
 				tpage = slot->ima;
 			}
diff --git a/source/blender/editors/space_sequencer/sequencer_edit.c b/source/blender/editors/space_sequencer/sequencer_edit.c
index 3ae4a233353e..e63569ac3867 100644
--- a/source/blender/editors/space_sequencer/sequencer_edit.c
+++ b/source/blender/editors/space_sequencer/sequencer_edit.c
@@ -3512,7 +3512,7 @@ static int sequencer_enable_proxies_exec(bContext *C, wmOperator *op)
 	bool proxy_50 = RNA_boolean_get(op->ptr, "proxy_50");
 	bool proxy_75 = RNA_boolean_get(op->ptr, "proxy_75");
 	bool proxy_100 = RNA_boolean_get(op->ptr, "proxy_100");
-	bool override = RNA_boolean_get(op->ptr, "override");
+	bool overwrite = RNA_boolean_get(op->ptr, "overwrite");
 	bool turnon = true;
 
 	if (ed == NULL || !(proxy_25 || proxy_50 || proxy_75 || proxy_100)) {
@@ -3548,7 +3548,7 @@ static int sequencer_enable_proxies_exec(bContext *C, wmOperator *op)
 				else 
 					seq->strip->proxy->build_size_flags &= ~SEQ_PROXY_IMAGE_SIZE_100;
 				
-				if (!override)
+				if (!overwrite)
 					seq->strip->proxy->build_flags |= SEQ_PROXY_SKIP_EXISTING;
 				else 
 					seq->strip->proxy->build_flags &= ~SEQ_PROXY_SKIP_EXISTING;
@@ -3580,7 +3580,7 @@ void SEQUENCER_OT_enable_proxies(wmOperatorType *ot)
 	RNA_def_boolean(ot->srna, "proxy_50", false, "50%", "");
 	RNA_def_boolean(ot->srna, "proxy_75", false, "75%", "");
 	RNA_def_boolean(ot->srna, "proxy_100", false, "100%", "");
-	RNA_def_boolean(ot->srna, "override", false, "Override", "");
+	RNA_def_boolean(ot->srna, "overwrite", false, "Overwrite", "");
 }
 
 /* change ops */
diff --git a/source/blender/editors/space_view3d/view3d_walk.c b/source/blender/editors/space_view3d/view3d_walk.c
index 542dc410bc3f..c6b73056a9a1 100644
--- a/source/blender/editors/space_view3d/view3d_walk.c
+++ b/source/blender/editors/space_view3d/view3d_walk.c
@@ -674,16 +674,6 @@ static int walkEnd(bContext *C, WalkInfo *walk)
 	return OPERATOR_CANCELLED;
 }
 
-static bool wm_event_is_last_mousemove(const wmEvent *event)
-{
-	while ((event = event->next)) {
-		if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
-			return false;
-		}
-	}
-	return true;
-}
-
 static void walkEvent(bContext *C, wmOperator *op, WalkInfo *walk, const wmEvent *event)
 {
 	if (event->type == TIMER && event->customdata == walk->timer) {
@@ -736,7 +726,7 @@ static void walkEvent(bContext *C, wmOperator *op, WalkInfo *walk, const wmEvent
 			}
 			else
 #endif
-			if (wm_event_is_last_mousemove(event)) {
+			if (WM_event_is_last_mousemove(event)) {
 				wmWindow *win = CTX_wm_window(C);
 
 #ifdef __APPLE__
diff --git a/source/blender/editors/transform/transform_snap_object.c b/source/blender/editors/transform/transform_snap_object.c
index fa17ab34cf99..9e94b2835d5e 100644
--- a/source/blender/editors/transform/transform_snap_object.c
+++ b/source/blender/editors/transform/transform_snap_object.c
@@ -138,85 +138,53 @@ struct SnapObjectContext {
 /** Common utilities
 * \{ */
 
-struct SnapObject {
-	struct SnapObject *next, *prev;
 
-	bool use_obedit;
-	struct Object *ob;
-	float obmat[4][4];
-};
+typedef void(*IterSnapObjsCallback)(SnapObjectContext *sctx, bool is_obedit, Object *ob, float obmat[4][4], void *data);
 
 /**
  * Walks through all objects in the scene to create the list of objets to snap.
  *
  * \param sctx: Snap context to store data.
  * \param snap_select : from enum SnapSelect.
- * \param use_object_edit_cage : Uses the coordinates of BMesh(if any) to do the snapping.
- *
+ * \param obedit : Object Edited to use its coordinates of BMesh(if any) to do the snapping.
  */
-static void create_object_list(
+static void iter_snap_objects(
         SnapObjectContext *sctx,
-        const SnapSelect snap_select, const bool use_object_edit_cage, ListBase *r_obj_list)
+        const SnapSelect snap_select,
+        Object *obedit,
+        IterSnapObjsCallback sob_callback,
+        void *data)
 {
-	r_obj_list->first = r_obj_list->last = NULL;
-
-	Object *obedit = use_object_edit_cage ? sctx->scene->obedit : NULL;
-
-	bool ignore_object_selected = false, ignore_object_active = false;
-	switch (snap_select) {
-		case SNAP_ALL:
-			break;
-		case SNAP_NOT_SELECTED:
-			ignore_object_selected = true;
-			break;
-		case SNAP_NOT_ACTIVE:
-			ignore_object_active = true;
-			break;
-	}
-
+	Base *base_act = sctx->scene->basact;
 	/* Need an exception for particle edit because the base is flagged with BA_HAS_RECALC_DATA
 	 * which makes the loop skip it, even the derived mesh will never change
 	 *
 	 * To solve that problem, we do it first as an exception.
 	 * */
-	Base *base_act = sctx->scene->basact;
 	if (base_act && base_act->object && base_act->object->mode & OB_MODE_PARTICLE_EDIT) {
-		struct SnapObject *sobj = MEM_mallocN(sizeof(*sobj), __func__);
-		sobj->use_obedit = false;
-		sobj->ob = base_act->object;
-		copy_m4_m4(sobj->obmat, sobj->ob->obmat);
-		BLI_addtail(r_obj_list, sobj);
+		sob_callback(sctx, false, base_act->object, base_act->object->obmat, data);
 	}
 
 	for (Base *base = sctx->scene->base.first; base != NULL; base = base->next) {
 		if ((BASE_VISIBLE_BGMODE(sctx->v3d_data.v3d, sctx->scene, base)) &&
 		    (base->flag & (BA_HAS_RECALC_OB | BA_HAS_RECALC_DATA)) == 0 &&
-
-			!((ignore_object_selected && (base->flag & (SELECT | BA_WAS_SEL))) ||
-			  (ignore_object_active && base == base_act)))
+			!((snap_select == SNAP_NOT_SELECTED && (base->flag & (SELECT | BA_WAS_SEL))) ||
+			  (snap_select == SNAP_NOT_ACTIVE && base == base_act)))
 		{
-			Object *ob = base->object;
-
-			if (ob->transflag & OB_DUPLI) {
+			bool use_obedit;
+			Object *obj = base->object;
+			if (obj->transflag & OB_DUPLI) {
 				DupliObject *dupli_ob;
-				ListBase *lb = object_duplilist(sctx->bmain->eval_ctx, sctx->scene, ob);
-
+				ListBase *lb = object_duplilist(sctx->bmain->eval_ctx, sctx->scene, obj);
 				for (dupli_ob = lb->first; dupli_ob; dupli_ob = dupli_ob->next) {
-					struct SnapObject *sobj = MEM_mallocN(sizeof(*sobj), __func__);
-					sobj->use_obedit = obedit && dupli_ob->ob->data == obedit->data;
-					sobj->ob = sobj->use_obedit ? obedit : dupli_ob->ob;;
-					copy_m4_m4(sobj->obmat, dupli_ob->mat);
-					BLI_addtail(r_obj_list, sobj);
+					use_obedit = obedit && dupli_ob->ob->data == obedit->data;
+					sob_callback(sctx, use_obedit, use_obedit ? obedit : dupli_ob->ob, dupli_ob->mat, data);
 				}
-
 				free_object_duplilist(lb);
 			}
 
-			struct SnapObject *sobj = MEM_mallocN(sizeof(*sobj), __func__);
-			sobj->use_obedit = obedit && ob->data == obedit->data;
-			sobj->ob = sobj->use_obedit ? obedit : ob;
-			copy_m4_m4(sobj->obmat, sobj->ob->obmat);
-			BLI_addtail(r_obj_list, sobj);
+			use_obedit = obedit && obj->data == obedit->data;
+			sob_callback(sctx, use_obedit, use_obedit ? obedit : obj, obj->obmat, data);
 		}
 	}
 }
@@ -262,17 +230,6 @@ MINLINE float depth_get(const float co[3], const float ray_start[3], const float
 	return dot_v3v3(dvec, ray_dir);
 }
 
-static float UNUSED_FUNCTION(dist_aabb_to_plane)(
-        const float bbmin[3], const float bbmax[3],
-        const float plane_co[3], const float plane_no[3])
-{
-	const float local_bvmin[3] = {
-		(plane_no[0] < 0) ? bbmax[0] : bbmin[0],
-		(plane_no[1] < 0) ? bbmax[1] : bbmin[1],
-		(plane_no[2] < 0) ? bbmax[2] : bbmin[2],
-	};
-	return depth_get(local_bvmin, plane_co, plane_no);
-}
 
 static bool walk_parent_bvhroot_cb(const BVHTreeAxisRange *bounds, void *userdata)
 {
@@ -285,6 +242,7 @@ static bool walk_parent_bvhroot_cb(const BVHTreeAxisRange *bounds, void *userdat
 	return false;
 }
 
+
 static bool isect_ray_bvhroot_v3(struct BVHTree *tree, const float ray_start[3], const float ray_dir[3], float *depth)
 {
 	BVHTreeRay ray;
@@ -612,8 +570,7 @@ static bool raycastEditMesh(
 	}
 
 	SnapObjectData_EditMesh *sod = NULL;
-
-	BVHTreeFromEditMesh *treedata;
+	BVHTreeFromEditMesh *treedata = NULL;
 
 	void **sod_p;
 	if (BLI_ghash_ensure_p(sctx->cache.object_map, ob, &sod_p)) {
@@ -822,6 +779,37 @@ static bool raycastObj(
 }
 
 
+struct RaycastObjUserData {
+	const float *ray_orig;
+	const float *ray_start;
+	const float *ray_dir;
+	const float *depth_range;
+	unsigned int ob_index;
+	/* read/write args */
+	float *ray_depth;
+	/* return args */
+	float *r_loc;
+	float *r_no;
+	int *r_index;
+	Object **r_ob;
+	float (*r_obmat)[4];
+	ListBase *r_hit_list;
+	bool ret;
+};
+
+static void raycast_obj_cb(SnapObjectContext *sctx, bool is_obedit, Object *ob, float obmat[4][4], void *data)
+{
+	struct RaycastObjUserData *dt = data;
+	dt->ret |= raycastObj(
+	        sctx,
+	        dt->ray_orig, dt->ray_start, dt->ray_dir, dt->depth_range,
+	        ob, obmat, dt->ob_index++, is_obedit,
+	        dt->ray_depth,
+	        dt->r_loc, dt->r_no, dt->r_index,
+	        dt->r_ob, dt->r_obmat,
+	        dt->r_hit_list);
+}
+
 /**
  * Main RayCast Function
  * ======================
@@ -862,24 +850,27 @@ static bool raycastObjects(
         Object **r_ob, float r_obmat[4][4],
         ListBase *r_hit_list)
 {
-	bool retval = false;
-
-	unsigned int ob_index = 0;
-
-	ListBase obj_list;
-	create_object_list(sctx, snap_select, use_object_edit_cage, &obj_list);
+	Object *obedit = use_object_edit_cage ? sctx->scene->obedit : NULL;
 
-	for (struct SnapObject *sobj = obj_list.first; sobj; sobj = sobj->next) {
-		retval |= raycastObj(
-		        sctx,
-		        ray_orig, ray_start, ray_dir, depth_range,
-		        sobj->ob, sobj->obmat, ob_index++, sobj->use_obedit,
-		        ray_depth, r_loc, r_no, r_index, r_ob, r_obmat, r_hit_list);
-	}
+	struct RaycastObjUserData data = {
+		.ray_orig = ray_orig,
+		.ray_start = ray_start,
+		.ray_dir = ray_dir,
+		.depth_range = depth_range,
+		.ob_index = 0,
+		.ray_depth = ray_depth,
+		.r_loc = r_loc,
+		.r_no = r_no,
+		.r_index = r_index,
+		.r_ob = r_ob,
+		.r_obmat = r_obmat,
+		.r_hit_list = r_hit_list,
+		.ret = false,
+	};
 
-	BLI_freelistN(&obj_list);
+	iter_snap_objects(sctx, snap_select, obedit, raycast_obj_cb, &data);
 
-	return retval;
+	return data.ret;
 }
 
 
@@ -1848,8 +1839,7 @@ static bool snapEditMesh(
 	float local_scale = normalize_v3(ray_normal_local);
 
 	SnapObjectData_EditMesh *sod = NULL;
-
-	BVHTreeFromEditMesh *treedata;
+	BVHTreeFromEditMesh *treedata = NULL;
 
 	void **sod_p;
 	if (BLI_ghash_ensure_p(sctx->cache.object_map, ob, &sod_p)) {
@@ -2052,6 +2042,33 @@ static bool snapObject(
 }
 
 
+struct SnapObjUserData {
+	SnapData *snapdata;
+	/* read/write args */
+	float *ray_depth;
+	float *dist_px;
+	/* return args */
+	float *r_loc;
+	float *r_no;
+	Object **r_ob;
+	float (*r_obmat)[4];
+	bool ret;
+};
+
+static void sanp_obj_cb(SnapObjectContext *sctx, bool is_obedit, Object *ob, float obmat[4][4], void *data)
+{
+	struct SnapObjUserData *dt = data;
+	dt->ret |= snapObject(
+	        sctx, dt->snapdata,
+	        ob, obmat, is_obedit,
+	        /* read/write args */
+	        dt->ray_depth, dt->dist_px,
+	        /* return args */
+	        dt->r_loc, dt->r_no,
+	        dt->r_ob, dt->r_obmat);
+}
+
+
 /**
  * Main Snapping Function
  * ======================
@@ -2089,21 +2106,22 @@ static bool snapObjectsRay(
         float r_loc[3], float r_no[3],
         Object **r_ob, float r_obmat[4][4])
 {
-	bool retval = false;
-
-	ListBase obj_list;
-	create_object_list(sctx, snap_select, use_object_edit_cage, &obj_list);
+	Object *obedit = use_object_edit_cage ? sctx->scene->obedit : NULL;
 
-	for (struct SnapObject *sobj = obj_list.first; sobj; sobj = sobj->next) {
-		retval |= snapObject(
-		        sctx, snapdata, sobj->ob, sobj->obmat, sobj->use_obedit,
-		        ray_depth, dist_px,
-		        r_loc, r_no, r_ob, r_obmat);
-	}
+	struct SnapObjUserData data = {
+		.snapdata = snapdata,
+		.ray_depth = ray_depth,
+		.dist_px = dist_px,
+		.r_loc = r_loc,
+		.r_no = r_no,
+		.r_ob = r_ob,
+		.r_obmat = r_obmat,
+		.ret = false,
+	};
 
-	BLI_freelistN(&obj_list);
+	iter_snap_objects(sctx, snap_select, obedit, sanp_obj_cb, &data);
 
-	return retval;
+	return data.ret;
 }
 
 /** \} */
diff --git a/source/blender/editors/uvedit/uvedit_ops.c b/source/blender/editors/uvedit/uvedit_ops.c
index 193b006cf0de..d7361f5a2596 100644
--- a/source/blender/editors/uvedit/uvedit_ops.c
+++ b/source/blender/editors/uvedit/uvedit_ops.c
@@ -1136,8 +1136,13 @@ static void uv_select_linked(Scene *scene, Image *ima, BMEditMesh *em, const flo
 
 	BM_mesh_elem_table_ensure(em->bm, BM_FACE); /* we can use this too */
 
-	/* use winding so we don't consider overlapping islands as connected, see T44320 */
-	vmap = BM_uv_vert_map_create(em->bm, limit, !select_faces, true);
+	/* Note, we had 'use winding' so we don't consider overlapping islands as connected, see T44320
+	 * this made *every* projection split the island into front/back islands.
+	 * Keep 'use_winding' to false, see: T50970.
+	 *
+	 * Better solve this by having a delimit option for select-linked operator,
+	 * keeping island-select working as is. */
+	vmap = BM_uv_vert_map_create(em->bm, limit, !select_faces, false);
 
 	if (vmap == NULL)
 		return;
diff --git a/source/blender/ikplugin/intern/iksolver_plugin.c b/source/blender/ikplugin/intern/iksolver_plugin.c
index 6ea311b2c7bc..f837789914e0 100644
--- a/source/blender/ikplugin/intern/iksolver_plugin.c
+++ b/source/blender/ikplugin/intern/iksolver_plugin.c
@@ -217,9 +217,27 @@ static void where_is_ik_bone(bPoseChannel *pchan, float ik_mat[3][3])   // nr =
 	copy_m4_m3(ikmat, ik_mat);
 
 	if (pchan->parent)
-		mul_m4_series(pchan->pose_mat, pchan->parent->pose_mat, pchan->chan_mat, ikmat);
+		mul_m4_m4m4(pchan->pose_mat, pchan->parent->pose_mat, pchan->chan_mat);
 	else
-		mul_m4_m4m4(pchan->pose_mat, pchan->chan_mat, ikmat);
+		copy_m4_m4(pchan->pose_mat, pchan->chan_mat);
+
+#ifdef USE_NONUNIFORM_SCALE
+	/* apply IK mat, but as if the bones have uniform scale since the IK solver
+	 * is not aware of non-uniform scale */
+	float scale[3];
+	mat4_to_size(scale, pchan->pose_mat);
+	normalize_v3_length(pchan->pose_mat[0], scale[1]);
+	normalize_v3_length(pchan->pose_mat[2], scale[1]);
+#endif
+
+	mul_m4_m4m4(pchan->pose_mat, pchan->pose_mat, ikmat);
+
+#ifdef USE_NONUNIFORM_SCALE
+	float ik_scale[3];
+	mat3_to_size(ik_scale, ik_mat);
+	normalize_v3_length(pchan->pose_mat[0], scale[0] * ik_scale[0]);
+	normalize_v3_length(pchan->pose_mat[2], scale[2] * ik_scale[2]);
+#endif
 
 	/* calculate head */
 	copy_v3_v3(pchan->pose_head, pchan->pose_mat[3]);
@@ -308,6 +326,10 @@ static void execute_posetree(struct Scene *scene, Object *ob, PoseTree *tree)
 		/* change length based on bone size */
 		length = bone->length * len_v3(R_bonemat[1]);
 
+		/* basis must be pure rotation */
+		normalize_m3(R_bonemat);
+		normalize_m3(R_parmat);
+
 		/* compute rest basis and its inverse */
 		copy_m3_m3(rest_basis, bone->bone_mat);
 		transpose_m3_m3(irest_basis, bone->bone_mat);
@@ -317,11 +339,7 @@ static void execute_posetree(struct Scene *scene, Object *ob, PoseTree *tree)
 		mul_m3_m3m3(full_basis, iR_parmat, R_bonemat);
 		mul_m3_m3m3(basis, irest_basis, full_basis);
 
-		/* basis must be pure rotation */
-		normalize_m3(basis);
-
 		/* transform offset into local bone space */
-		normalize_m3(iR_parmat);
 		mul_m3_v3(iR_parmat, start);
 
 		IK_SetTransform(seg, start, rest_basis, basis, length);
@@ -545,18 +563,6 @@ void iksolver_execute_tree(struct Scene *scene, Object *ob,  bPoseChannel *pchan
 			tree->pchan[a]->flag |= POSE_CHAIN;
 		}
 
-#ifdef USE_NONUNIFORM_SCALE
-		float (*pchan_scale_data)[3] = MEM_mallocN(sizeof(float[3]) * tree->totchannel, __func__);
-
-		for (a = 0; a < tree->totchannel; a++) {
-			mat4_to_size(pchan_scale_data[a], tree->pchan[a]->pose_mat);
-
-			/* make uniform at y scale since this controls the length */
-			normalize_v3_length(tree->pchan[a]->pose_mat[0], pchan_scale_data[a][1]);
-			normalize_v3_length(tree->pchan[a]->pose_mat[2], pchan_scale_data[a][1]);
-		}
-#endif
-
 		/* 5. execute the IK solver */
 		execute_posetree(scene, ob, tree);
 
@@ -571,14 +577,6 @@ void iksolver_execute_tree(struct Scene *scene, Object *ob,  bPoseChannel *pchan
 			where_is_ik_bone(tree->pchan[a], tree->basis_change[a]);
 		}
 
-#ifdef USE_NONUNIFORM_SCALE
-		for (a = 0; a < tree->totchannel; a++) {
-			normalize_v3_length(tree->pchan[a]->pose_mat[0], pchan_scale_data[a][0]);
-			normalize_v3_length(tree->pchan[a]->pose_mat[2], pchan_scale_data[a][2]);
-		}
-		MEM_freeN(pchan_scale_data);
-#endif
-
 		/* 7. and free */
 		BLI_remlink(&pchan_root->iktree, tree);
 		free_posetree(tree);
diff --git a/source/blender/makesrna/intern/rna_userdef.c b/source/blender/makesrna/intern/rna_userdef.c
index c0f2dbd07068..7a978c358108 100644
--- a/source/blender/makesrna/intern/rna_userdef.c
+++ b/source/blender/makesrna/intern/rna_userdef.c
@@ -3926,12 +3926,18 @@ static void rna_def_userdef_system(BlenderRNA *brna)
 
 	prop = RNA_def_property(srna, "dpi", PROP_INT, PROP_NONE);
 	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
-	RNA_def_property_ui_text(prop, "DPI", "Font size and resolution for display");
+	RNA_def_property_ui_text(prop, "DPI",
+	                         "DPI for addons to use when drawing custom user interface elements. Controlled by "
+	                         "operating system settings and Blender UI scale, with a reference value of 72 DPI. "
+	                         "Note that since this value includes a user defined scale, it is not always the "
+	                         "actual monitor DPI");
 
 	prop = RNA_def_property(srna, "pixel_size", PROP_FLOAT, PROP_NONE);
 	RNA_def_property_clear_flag(prop, PROP_EDITABLE);
 	RNA_def_property_float_sdna(prop, NULL, "pixelsize");
-	RNA_def_property_ui_text(prop, "Pixel Size", "");
+	RNA_def_property_ui_text(prop, "Pixel Size",
+	                         "Suggested line thickness and point size in pixels, for addons drawing custom user "
+	                         "interface elements. Controlled by operating system settings and Blender UI scale");
 
 	prop = RNA_def_property(srna, "font_path_ui", PROP_STRING, PROP_FILEPATH);
 	RNA_def_property_string_sdna(prop, NULL, "font_path_ui");
diff --git a/source/blender/python/generic/bpy_internal_import.c b/source/blender/python/generic/bpy_internal_import.c
index ed2752d83723..7ab6447d21a1 100644
--- a/source/blender/python/generic/bpy_internal_import.c
+++ b/source/blender/python/generic/bpy_internal_import.c
@@ -248,8 +248,17 @@ PyObject *bpy_text_reimport(PyObject *module, int *found)
 	if ((name = PyModule_GetName(module)) == NULL)
 		return NULL;
 
-	if ((filepath = (char *)PyModule_GetFilename(module)) == NULL)
-		return NULL;
+	{
+		PyObject *module_file = PyModule_GetFilenameObject(module);
+		if (module_file == NULL) {
+			return NULL;
+		}
+		filepath = (char *)_PyUnicode_AsString(module_file);
+		Py_DECREF(module_file);
+		if (filepath == NULL) {
+			return NULL;
+		}
+	}
 
 	/* look up the text object */
 	text = BLI_findstring(&maggie->text, BLI_path_basename(filepath), offsetof(ID, name) + 2);
diff --git a/source/blender/python/generic/py_capi_utils.c b/source/blender/python/generic/py_capi_utils.c
index 2e789d6d4b3e..861e2dbb0df4 100644
--- a/source/blender/python/generic/py_capi_utils.c
+++ b/source/blender/python/generic/py_capi_utils.c
@@ -300,7 +300,14 @@ void PyC_FileAndNum(const char **filename, int *lineno)
 		if (mod_name) {
 			PyObject *mod = PyDict_GetItem(PyImport_GetModuleDict(), mod_name);
 			if (mod) {
-				*filename = PyModule_GetFilename(mod);
+				PyObject *mod_file = PyModule_GetFilenameObject(mod);
+				if (mod_file) {
+					*filename = _PyUnicode_AsString(mod_name);
+					Py_DECREF(mod_file);
+				}
+				else {
+					PyErr_Clear();
+				}
 			}
 
 			/* unlikely, fallback */
diff --git a/source/blender/python/intern/bpy_interface.c b/source/blender/python/intern/bpy_interface.c
index 54eddcd88467..a51fb8b8cf4a 100644
--- a/source/blender/python/intern/bpy_interface.c
+++ b/source/blender/python/intern/bpy_interface.c
@@ -872,6 +872,7 @@ static void bpy_module_delay_init(PyObject *bpy_proxy)
 
 	BLI_strncpy(filename_abs, filename_rel, sizeof(filename_abs));
 	BLI_path_cwd(filename_abs, sizeof(filename_abs));
+	Py_DECREF(filename_obj);
 
 	argv[0] = filename_abs;
 	argv[1] = NULL;
diff --git a/source/blender/python/intern/bpy_props.c b/source/blender/python/intern/bpy_props.c
index c7787ba96829..362c0281b363 100644
--- a/source/blender/python/intern/bpy_props.c
+++ b/source/blender/python/intern/bpy_props.c
@@ -2697,7 +2697,8 @@ PyDoc_STRVAR(BPy_EnumProperty_doc,
 "      :icon: An icon string identifier or integer icon value\n"
 "         (e.g. returned by :class:`bpy.types.UILayout.icon`)\n"
 "      :number: Unique value used as the identifier for this item (stored in file data).\n"
-"         Use when the identifier may need to change.\n"
+"         Use when the identifier may need to change. If the *ENUM_FLAG* option is used,\n"
+"         the values are bitmasks and should be powers of two.\n"
 "\n"
 "      When an item only contains 4 items they define ``(identifier, name, description, number)``.\n"
 "\n"
diff --git a/source/blender/windowmanager/WM_api.h b/source/blender/windowmanager/WM_api.h
index 60a39b24208f..a91c30c28075 100644
--- a/source/blender/windowmanager/WM_api.h
+++ b/source/blender/windowmanager/WM_api.h
@@ -187,8 +187,9 @@ struct wmEventHandler *WM_event_add_dropbox_handler(ListBase *handlers, ListBase
 
 			/* mouse */
 void		WM_event_add_mousemove(struct bContext *C);
-bool        WM_modal_tweak_exit(const struct wmEvent *event, int tweak_event);
+bool		WM_event_is_modal_tweak_exit(const struct wmEvent *event, int tweak_event);
 bool		WM_event_is_absolute(const struct wmEvent *event);
+bool		WM_event_is_last_mousemove(const struct wmEvent *event);
 
 #ifdef WITH_INPUT_NDOF
 			/* 3D mouse */
diff --git a/source/blender/windowmanager/intern/wm_event_system.c b/source/blender/windowmanager/intern/wm_event_system.c
index f26ee0e73ec7..32f978ae891e 100644
--- a/source/blender/windowmanager/intern/wm_event_system.c
+++ b/source/blender/windowmanager/intern/wm_event_system.c
@@ -615,6 +615,16 @@ bool WM_event_is_absolute(const wmEvent *event)
 	return (event->tablet_data != NULL);
 }
 
+bool WM_event_is_last_mousemove(const wmEvent *event)
+{
+	while ((event = event->next)) {
+		if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
+			return false;
+		}
+	}
+	return true;
+}
+
 #ifdef WITH_INPUT_NDOF
 void WM_ndof_deadzone_set(float deadzone)
 {
@@ -2852,7 +2862,7 @@ void WM_event_add_mousemove(bContext *C)
 
 
 /* for modal callbacks, check configuration for how to interpret exit with tweaks  */
-bool WM_modal_tweak_exit(const wmEvent *event, int tweak_event)
+bool WM_event_is_modal_tweak_exit(const wmEvent *event, int tweak_event)
 {
 	/* if the release-confirm userpref setting is enabled, 
 	 * tweak events can be canceled when mouse is released
diff --git a/source/blender/windowmanager/intern/wm_window.c b/source/blender/windowmanager/intern/wm_window.c
index f939df4a4db7..5d471a96b465 100644
--- a/source/blender/windowmanager/intern/wm_window.c
+++ b/source/blender/windowmanager/intern/wm_window.c
@@ -379,6 +379,11 @@ void WM_window_set_dpi(wmWindow *win)
 {
 	int auto_dpi = GHOST_GetDPIHint(win->ghostwin);
 
+	/* Clamp auto DPI to 96, since our font/interface drawing does not work well
+	 * with lower sizes. The main case we are interested in supporting is higher
+	 * DPI. If a smaller UI is desired it is still possible to adjust UI scale. */
+	auto_dpi = MAX2(auto_dpi, 96);
+
 	/* Lazily init UI scale size, preserving backwards compatibility by
 	 * computing UI scale from ratio of previous DPI and auto DPI */
 	if (U.ui_scale == 0) {
diff --git a/tests/python/bl_load_py_modules.py b/tests/python/bl_load_py_modules.py
index 4935491a6bee..80933cd5b611 100644
--- a/tests/python/bl_load_py_modules.py
+++ b/tests/python/bl_load_py_modules.py
@@ -38,7 +38,7 @@
     'io_import_dxf',  # Because of cydxfentity.so dependency
 
     # The unpacked wheel is only loaded when actually used, not directly on import:
-    "io_blend_utils/blender_bam-unpacked.whl",
+    os.path.join("io_blend_utils", "blender_bam-unpacked.whl"),
     }
 
 # Some modules need to add to the `sys.path`.