[Native File Dialog] Add support for using native dialogs in the editor.

doc/classes/EditorFileDialog.xml

@@ -19,6 +19,16 @@
 				For example, a [param filter] of [code]"*.tscn, *.scn"[/code] and a [param description] of [code]"Scenes"[/code] results in filter text "Scenes (*.tscn, *.scn)".
 			</description>
 		</method>
+		<method name="add_option">
+			<return type="void" />
+			<param index="0" name="name" type="String" />
+			<param index="1" name="values" type="PackedStringArray" />
+			<param index="2" name="default_value_index" type="int" />
+			<description>
+				Adds an additional [OptionButton] to the file dialog. If [param values] is empty, a [CheckBox] is added instead.
+				[param default_value_index] should be an index of the value in the [param values]. If [param values] is empty it should be either [code]1[/code] (checked), or [code]0[/code] (unchecked).
+			</description>
+		</method>
 		<method name="add_side_menu">
 			<return type="void" />
 			<param index="0" name="menu" type="Control" />
@@ -40,6 +50,33 @@
 				[b]Warning:[/b] This is a required internal node, removing and freeing it may cause a crash. If you wish to hide it or any of its children, use their [member CanvasItem.visible] property.
 			</description>
 		</method>
+		<method name="get_option_default" qualifiers="const">
+			<return type="int" />
+			<param index="0" name="option" type="int" />
+			<description>
+				Returns the default value index of the [OptionButton] or [CheckBox] with index [param option].
+			</description>
+		</method>
+		<method name="get_option_name" qualifiers="const">
+			<return type="String" />
+			<param index="0" name="option" type="int" />
+			<description>
+				Returns the name of the [OptionButton] or [CheckBox] with index [param option].
+			</description>
+		</method>
+		<method name="get_option_values" qualifiers="const">
+			<return type="PackedStringArray" />
+			<param index="0" name="option" type="int" />
+			<description>
+				Returns an array of values of the [OptionButton] with index [param option].
+			</description>
+		</method>
+		<method name="get_selected_options" qualifiers="const">
+			<return type="Dictionary" />
+			<description>
+				Returns a [Dictionary] with the selected values of the additional [OptionButton]s and/or [CheckBox]es. [Dictionary] keys are names and values are selected value indices.
+			</description>
+		</method>
 		<method name="get_vbox">
 			<return type="VBoxContainer" />
 			<description>
@@ -53,6 +90,30 @@
 				Notify the [EditorFileDialog] that its view of the data is no longer accurate. Updates the view contents on next view update.
 			</description>
 		</method>
+		<method name="set_option_default">
+			<return type="void" />
+			<param index="0" name="option" type="int" />
+			<param index="1" name="default_value_index" type="int" />
+			<description>
+				Sets the default value index of the [OptionButton] or [CheckBox] with index [param option].
+			</description>
+		</method>
+		<method name="set_option_name">
+			<return type="void" />
+			<param index="0" name="option" type="int" />
+			<param index="1" name="name" type="String" />
+			<description>
+				Sets the name of the [OptionButton] or [CheckBox] with index [param option].
+			</description>
+		</method>
+		<method name="set_option_values">
+			<return type="void" />
+			<param index="0" name="option" type="int" />
+			<param index="1" name="values" type="PackedStringArray" />
+			<description>
+				Sets the option values of the [OptionButton] with index [param option].
+			</description>
+		</method>
 	</methods>
 	<members>
 		<member name="access" type="int" setter="set_access" getter="get_access" enum="EditorFileDialog.Access" default="0">
@@ -80,6 +141,9 @@
 		<member name="filters" type="PackedStringArray" setter="set_filters" getter="get_filters" default="PackedStringArray()">
 			The available file type filters. For example, this shows only [code].png[/code] and [code].gd[/code] files: [code]set_filters(PackedStringArray(["*.png ; PNG Images","*.gd ; GDScript Files"]))[/code]. Multiple file types can also be specified in a single filter. [code]"*.png, *.jpg, *.jpeg ; Supported Images"[/code] will show both PNG and JPEG files when selected.
 		</member>
+		<member name="option_count" type="int" setter="set_option_count" getter="get_option_count" default="0">
+			The number of additional [OptionButton]s and [CheckBox]es in the dialog.
+		</member>
 		<member name="show_hidden_files" type="bool" setter="set_show_hidden_files" getter="is_showing_hidden_files" default="false">
 			If [code]true[/code], hidden files and directories will be visible in the [EditorFileDialog]. This property is synchronized with [member EditorSettings.filesystem/file_dialog/show_hidden_files].
 		</member>

doc/classes/EditorSettings.xml

@@ -714,6 +714,9 @@
 			If [code]true[/code], editor main menu is using embedded [MenuBar] instead of system global menu.
 			Specific to the macOS platform.
 		</member>
+		<member name="interface/editor/use_native_file_dialogs" type="bool" setter="" getter="">
+			If [code]true[/code], editor UI uses OS native file/directory selection dialogs.
+		</member>
 		<member name="interface/editor/vsync_mode" type="int" setter="" getter="">
 			Sets the V-Sync mode for the editor. Does not affect the project when run from the editor (this is controlled by [member ProjectSettings.display/window/vsync/vsync_mode]).
 			Depending on the platform and used renderer, the engine will fall back to [b]Enabled[/b] if the desired mode is not supported.

doc/classes/FileDialog.xml

@@ -23,9 +23,10 @@
 			<return type="void" />
 			<param index="0" name="name" type="String" />
 			<param index="1" name="values" type="PackedStringArray" />
-			<param index="2" name="index" type="int" />
+			<param index="2" name="default_value_index" type="int" />
 			<description>
 				Adds an additional [OptionButton] to the file dialog. If [param values] is empty, a [CheckBox] is added instead.
+				[param default_value_index] should be an index of the value in the [param values]. If [param values] is empty it should be either [code]1[/code] (checked), or [code]0[/code] (unchecked).
 			</description>
 		</method>
 		<method name="clear_filters">
@@ -90,7 +91,7 @@
 		<method name="set_option_default">
 			<return type="void" />
 			<param index="0" name="option" type="int" />
-			<param index="1" name="index" type="int" />
+			<param index="1" name="default_value_index" type="int" />
 			<description>
 				Sets the default value index of the [OptionButton] or [CheckBox] with index [param option].
 			</description>

editor/editor_node.cpp

@@ -2066,8 +2066,9 @@ void EditorNode::_dialog_action(String p_file) {
 		} break;
 
 		case FILE_EXPORT_MESH_LIBRARY: {
-			bool merge_with_existing_library = file_export_lib_merge->is_pressed();
-			bool apply_mesh_instance_transforms = file_export_lib_apply_xforms->is_pressed();
+			const Dictionary &fd_options = file_export_lib->get_selected_options();
+			bool merge_with_existing_library = fd_options.get(TTR("Merge With Existing"), true);
+			bool apply_mesh_instance_transforms = fd_options.get(TTR("Apply MeshInstance Transforms"), false);
 
 			Ref<MeshLibrary> ml;
 			if (merge_with_existing_library && FileAccess::exists(p_file)) {
@@ -2723,8 +2724,8 @@ void EditorNode::_menu_option_confirm(int p_option, bool p_confirmed) {
 				root_name = EditorNode::adjust_scene_name_casing(root_name);
 				file->set_current_path(root_name + "." + extensions.front()->get().to_lower());
 			}
-			file->popup_file_dialog();
 			file->set_title(TTR("Save Scene As..."));
+			file->popup_file_dialog();
 
 		} break;
 
@@ -3238,8 +3239,8 @@ void EditorNode::_export_as_menu_option(int p_idx) {
 			file_export_lib->add_filter("*." + E);
 		}
 
-		file_export_lib->popup_file_dialog();
 		file_export_lib->set_title(TTR("Export Mesh Library"));
+		file_export_lib->popup_file_dialog();
 	} else { // Custom menu options added by plugins
 		if (export_as_menu->get_item_submenu(p_idx).is_empty()) { // If not a submenu
 			Callable callback = export_as_menu->get_item_metadata(p_idx);
@@ -7128,16 +7129,8 @@ EditorNode::EditorNode() {
 	file_export_lib->set_title(TTR("Export Library"));
 	file_export_lib->set_file_mode(EditorFileDialog::FILE_MODE_SAVE_FILE);
 	file_export_lib->connect("file_selected", callable_mp(this, &EditorNode::_dialog_action));
-	file_export_lib_merge = memnew(CheckBox);
-	file_export_lib_merge->set_text(TTR("Merge With Existing"));
-	file_export_lib_merge->set_h_size_flags(Control::SIZE_SHRINK_CENTER);
-	file_export_lib_merge->set_pressed(true);
-	file_export_lib->get_vbox()->add_child(file_export_lib_merge);
-	file_export_lib_apply_xforms = memnew(CheckBox);
-	file_export_lib_apply_xforms->set_text(TTR("Apply MeshInstance Transforms"));
-	file_export_lib_apply_xforms->set_h_size_flags(Control::SIZE_SHRINK_CENTER);
-	file_export_lib_apply_xforms->set_pressed(false);
-	file_export_lib->get_vbox()->add_child(file_export_lib_apply_xforms);
+	file_export_lib->add_option(TTR("Merge With Existing"), Vector<String>(), true);
+	file_export_lib->add_option(TTR("Apply MeshInstance Transforms"), Vector<String>(), false);
 	gui_base->add_child(file_export_lib);
 
 	file_script = memnew(EditorFileDialog);

editor/editor_node.h

@@ -399,8 +399,6 @@ class EditorNode : public Node {
 	EditorFileDialog *file_export_lib = nullptr;
 	EditorFileDialog *file_script = nullptr;
 	EditorFileDialog *file_android_build_source = nullptr;
-	CheckBox *file_export_lib_merge = nullptr;
-	CheckBox *file_export_lib_apply_xforms = nullptr;
 	String current_path;
 	MenuButton *update_spinner = nullptr;
 

editor/editor_settings.cpp

@@ -417,6 +417,7 @@ void EditorSettings::_load_defaults(Ref<ConfigFile> p_extra_config) {
 	set_restart_if_changed("interface/editor/debug/enable_pseudolocalization", true);
 	// Use pseudolocalization in editor.
 	EDITOR_SETTING_USAGE(Variant::BOOL, PROPERTY_HINT_NONE, "interface/editor/use_embedded_menu", false, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_RESTART_IF_CHANGED)
+	EDITOR_SETTING_USAGE(Variant::BOOL, PROPERTY_HINT_NONE, "interface/editor/use_native_file_dialogs", false, "", PROPERTY_USAGE_DEFAULT)
 	EDITOR_SETTING_USAGE(Variant::BOOL, PROPERTY_HINT_NONE, "interface/editor/expand_to_title", true, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_RESTART_IF_CHANGED)
 
 	EDITOR_SETTING(Variant::INT, PROPERTY_HINT_RANGE, "interface/editor/main_font_size", 14, "8,48,1")

editor/export/project_export.cpp

@@ -1035,10 +1035,13 @@ void ProjectExportDialog::_export_pck_zip_selected(const String &p_path) {
 	Ref<EditorExportPlatform> platform = current->get_platform();
 	ERR_FAIL_COND(platform.is_null());
 
+	const Dictionary &fd_option = export_pck_zip->get_selected_options();
+	bool export_debug = fd_option.get(TTR("Export With Debug"), true);
+
 	if (p_path.ends_with(".zip")) {
-		platform->export_zip(current, export_pck_zip_debug->is_pressed(), p_path);
+		platform->export_zip(current, export_debug, p_path);
 	} else if (p_path.ends_with(".pck")) {
-		platform->export_pack(current, export_pck_zip_debug->is_pressed(), p_path);
+		platform->export_pack(current, export_debug, p_path);
 	} else {
 		ERR_FAIL_MSG("Path must end with .pck or .zip");
 	}
@@ -1123,7 +1126,10 @@ void ProjectExportDialog::_export_project_to_path(const String &p_path) {
 
 	platform->clear_messages();
 	current->update_value_overrides();
-	Error err = platform->export_project(current, export_debug->is_pressed(), current->get_export_path(), 0);
+	Dictionary fd_option = export_project->get_selected_options();
+	bool export_debug = fd_option.get(TTR("Export With Debug"), true);
+
+	Error err = platform->export_project(current, export_debug, current->get_export_path(), 0);
 	result_dialog_log->clear();
 	if (err != ERR_SKIP) {
 		if (platform->fill_log_messages(result_dialog_log, err)) {
@@ -1552,17 +1558,8 @@ ProjectExportDialog::ProjectExportDialog() {
 	export_project->connect("file_selected", callable_mp(this, &ProjectExportDialog::_export_project_to_path));
 	export_project->get_line_edit()->connect("text_changed", callable_mp(this, &ProjectExportDialog::_validate_export_path));
 
-	export_debug = memnew(CheckBox);
-	export_debug->set_text(TTR("Export With Debug"));
-	export_debug->set_pressed(true);
-	export_debug->set_h_size_flags(Control::SIZE_SHRINK_CENTER);
-	export_project->get_vbox()->add_child(export_debug);
-
-	export_pck_zip_debug = memnew(CheckBox);
-	export_pck_zip_debug->set_text(TTR("Export With Debug"));
-	export_pck_zip_debug->set_pressed(true);
-	export_pck_zip_debug->set_h_size_flags(Control::SIZE_SHRINK_CENTER);
-	export_pck_zip->get_vbox()->add_child(export_pck_zip_debug);
+	export_project->add_option(TTR("Export With Debug"), Vector<String>(), true);
+	export_pck_zip->add_option(TTR("Export With Debug"), Vector<String>(), true);
 
 	set_hide_on_ok(false);
 

editor/export/project_export.h

@@ -154,8 +154,6 @@ class ProjectExportDialog : public ConfirmationDialog {
 
 	EditorFileDialog *export_pck_zip = nullptr;
 	EditorFileDialog *export_project = nullptr;
-	CheckBox *export_debug = nullptr;
-	CheckBox *export_pck_zip_debug = nullptr;
 
 	CheckButton *enc_pck = nullptr;
 	CheckButton *enc_directory = nullptr;