feat: Fix caps-lock input delay (ublue-os#757)

usr/etc/dconf/db/local.d/01-ublue

@@ -23,6 +23,9 @@ picture-options='zoom'
 primary-color='000000'
 secondary-color='FFFFFF'
 
+[org/gnome/desktop/input-sources]
+xkb-options=['caps:ctrl_modifier']
+
 [org/gnome/desktop/interface]
 enable-hot-corners=false
 clock-show-weekday=true

usr/share/X11/xkb/symbols/capslock

@@ -0,0 +1,85 @@
+default  hidden partial modifier_keys
+xkb_symbols "capslock" {
+    replace key <CAPS> { [ Caps_Lock ], type[group1] = "ONE_LEVEL" };
+    modifier_map Lock { Caps_Lock };
+};
+
+hidden partial modifier_keys
+xkb_symbols "shiftlock" {
+    replace key <CAPS> { [ Shift_Lock ], type[group1] = "ONE_LEVEL" };
+    modifier_map Shift { Shift_Lock };
+};
+
+hidden partial modifier_keys
+xkb_symbols "swapescape" {
+    key <CAPS> { [ Escape ], type[group1] = "ONE_LEVEL" };
+    key <ESC>  { [ Caps_Lock ] };
+};
+
+hidden partial modifier_keys
+xkb_symbols "escape" {
+    key <CAPS> { [ Escape ], type[group1] = "ONE_LEVEL" };
+};
+
+hidden partial modifier_keys
+xkb_symbols "escape_shifted_capslock" {
+    key <CAPS> {
+        type[Group1] = "TWO_LEVEL",
+        symbols[Group1] = [ Escape, Caps_Lock ],
+        actions[Group1] = [ NoAction(), LockMods(modifiers = Lock) ]
+    };
+};
+
+hidden partial modifier_keys
+xkb_symbols "escape_shifted_compose" {
+    key <CAPS> {
+        type[Group1] = "TWO_LEVEL",
+        symbols[Group1] = [ Escape, Multi_key ],
+        actions[Group1] = [ NoAction(), NoAction() ]
+    };
+};
+
+hidden partial modifier_keys
+xkb_symbols "backspace" {
+    key <CAPS> { [ BackSpace ], type[group1] = "ONE_LEVEL" };
+};
+
+hidden partial modifier_keys
+xkb_symbols "super" {
+    key <CAPS> { [ Super_L ], type[group1] = "ONE_LEVEL" };
+    modifier_map Mod4 { <CAPS> };
+};
+
+hidden partial modifier_keys
+xkb_symbols "hyper" {
+    key <CAPS> { [ Hyper_L ], type[group1] = "ONE_LEVEL" };
+    modifier_map Mod4 { <CAPS> };
+};
+
+hidden partial modifier_keys
+xkb_symbols "menu" {
+    key <CAPS> { [ Menu ], type[group1] = "ONE_LEVEL" };
+};
+
+hidden partial modifier_keys
+xkb_symbols "numlock" {
+    key <CAPS> { [ Num_Lock ], type[group1] = "ONE_LEVEL" };
+};
+
+// This changes the <CAPS> key to become a Control modifier,
+// but it will still produce the Caps_Lock keysym.
+hidden partial modifier_keys
+xkb_symbols "ctrl_modifier" {
+		  key <CAPS> {
+		      type="ALPHABETIC",
+		      repeat=No,
+		      symbols[Group1]= [ Caps_Lock, Caps_Lock ],
+		      actions[Group1]= [ LockMods(modifiers=Lock),
+		                         LockMods(modifiers=Shift+Lock,affect=unlock) ]
+		  };
+};
+
+hidden partial modifier_keys
+xkb_symbols "none" {
+    key <CAPS> { [ VoidSymbol ], type[group1] = "ONE_LEVEL" };
+};