21 files changed, 110 insertions, 56 deletions
diff --git a/doc/classes/Callable.xml b/doc/classes/Callable.xml
index d1fdaef29c..79e65f3472 100644
--- a/doc/classes/Callable.xml
+++ b/doc/classes/Callable.xml
@@ -14,7 +14,7 @@
 		func test():
 		    var callable = Callable(self, "print_args")
 		    callable.call("hello", "world")  # Prints "hello world ".
-		    callable.call(Vector2.UP, 42, callable)  # Prints "(0, -1) 42 Node(Node.gd)::print_args".
+		    callable.call(Vector2.UP, 42, callable)  # Prints "(0, -1) 42 Node(node.gd)::print_args".
 		    callable.call("invalid")  # Invalid call, should have at least 2 arguments.
 		[/gdscript]
 		[csharp]
diff --git a/doc/classes/CanvasItem.xml b/doc/classes/CanvasItem.xml
index fbab1d76a0..e79bb97a92 100644
--- a/doc/classes/CanvasItem.xml
+++ b/doc/classes/CanvasItem.xml
@@ -95,11 +95,12 @@
 			<param index="0" name="from" type="Vector2" />
 			<param index="1" name="to" type="Vector2" />
 			<param index="2" name="color" type="Color" />
-			<param index="3" name="width" type="float" default="1.0" />
+			<param index="3" name="width" type="float" default="-1.0" />
 			<param index="4" name="dash" type="float" default="2.0" />
 			<param index="5" name="aligned" type="bool" default="true" />
 			<description>
 				Draws a dashed line from a 2D point to another, with a given color and width. See also [method draw_multiline] and [method draw_polyline].
+				If [param width] is negative, then a two-point primitives will be drawn instead of a four-point ones. This means that when the CanvasItem is scaled, the line parts will remain thin. If this behavior is not desired, then pass a positive [param width] like [code]1.0[/code].
 			</description>
 		</method>
 		<method name="draw_end_animation">
@@ -130,10 +131,11 @@
 			<param index="0" name="from" type="Vector2" />
 			<param index="1" name="to" type="Vector2" />
 			<param index="2" name="color" type="Color" />
-			<param index="3" name="width" type="float" default="1.0" />
+			<param index="3" name="width" type="float" default="-1.0" />
 			<param index="4" name="antialiased" type="bool" default="false" />
 			<description>
 				Draws a line from a 2D point to another, with a given color and width. It can be optionally antialiased. See also [method draw_multiline] and [method draw_polyline].
+				If [param width] is negative, then a two-point primitive will be drawn instead of a four-point one. This means that when the CanvasItem is scaled, the line will remain thin. If this behavior is not desired, then pass a positive [param width] like [code]1.0[/code].
 			</description>
 		</method>
 		<method name="draw_mesh">
@@ -165,18 +167,20 @@
 			<return type="void" />
 			<param index="0" name="points" type="PackedVector2Array" />
 			<param index="1" name="color" type="Color" />
-			<param index="2" name="width" type="float" default="1.0" />
+			<param index="2" name="width" type="float" default="-1.0" />
 			<description>
 				Draws multiple disconnected lines with a uniform [param color]. When drawing large amounts of lines, this is faster than using individual [method draw_line] calls. To draw interconnected lines, use [method draw_polyline] instead.
+				If [param width] is negative, then two-point primitives will be drawn instead of a four-point ones. This means that when the CanvasItem is scaled, the lines will remain thin. If this behavior is not desired, then pass a positive [param width] like [code]1.0[/code].
 			</description>
 		</method>
 		<method name="draw_multiline_colors">
 			<return type="void" />
 			<param index="0" name="points" type="PackedVector2Array" />
 			<param index="1" name="colors" type="PackedColorArray" />
-			<param index="2" name="width" type="float" default="1.0" />
+			<param index="2" name="width" type="float" default="-1.0" />
 			<description>
 				Draws multiple disconnected lines with a uniform [param width] and segment-by-segment coloring. Colors assigned to line segments match by index between [param points] and [param colors]. When drawing large amounts of lines, this is faster than using individual [method draw_line] calls. To draw interconnected lines, use [method draw_polyline_colors] instead.
+				If [param width] is negative, then two-point primitives will be drawn instead of a four-point ones. This means that when the CanvasItem is scaled, the lines will remain thin. If this behavior is not desired, then pass a positive [param width] like [code]1.0[/code].
 			</description>
 		</method>
 		<method name="draw_multiline_string" qualifiers="const">
@@ -260,7 +264,6 @@
 			<param index="1" name="colors" type="PackedColorArray" />
 			<param index="2" name="uvs" type="PackedVector2Array" />
 			<param index="3" name="texture" type="Texture2D" default="null" />
-			<param index="4" name="width" type="float" default="1.0" />
 			<description>
 				Draws a custom primitive. 1 point for a point, 2 points for a line, 3 points for a triangle, and 4 points for a quad. If 0 points or more than 4 points are specified, nothing will be drawn and an error message will be printed. See also [method draw_line], [method draw_polyline], [method draw_polygon], and [method draw_rect].
 			</description>
@@ -270,10 +273,12 @@
 			<param index="0" name="rect" type="Rect2" />
 			<param index="1" name="color" type="Color" />
 			<param index="2" name="filled" type="bool" default="true" />
-			<param index="3" name="width" type="float" default="1.0" />
+			<param index="3" name="width" type="float" default="-1.0" />
 			<description>
 				Draws a rectangle. If [param filled] is [code]true[/code], the rectangle will be filled with the [param color] specified. If [param filled] is [code]false[/code], the rectangle will be drawn as a stroke with the [param color] and [param width] specified.
+				If [param width] is negative, then two-point primitives will be drawn instead of a four-point ones. This means that when the CanvasItem is scaled, the lines will remain thin. If this behavior is not desired, then pass a positive [param width] like [code]1.0[/code].
 				[b]Note:[/b] [param width] is only effective if [param filled] is [code]false[/code].
+				[b]Note:[/b] Unfilled rectangles drawn with a negative [param width] may not display perfectly. For example, corners may be missing or brighter due to overlapping lines (for a translucent [param color]).
 			</description>
 		</method>
 		<method name="draw_set_transform">
diff --git a/doc/classes/Control.xml b/doc/classes/Control.xml
index 08964cf21d..75afb0cdbf 100644
--- a/doc/classes/Control.xml
+++ b/doc/classes/Control.xml
@@ -180,14 +180,14 @@
 				[codeblocks]
 				[gdscript]
 				func _make_custom_tooltip(for_text):
-				    var tooltip = preload("res://SomeTooltipScene.tscn").instantiate()
+				    var tooltip = preload("res://some_tooltip_scene.tscn").instantiate()
 				    tooltip.get_node("Label").text = for_text
 				    return tooltip
 				[/gdscript]
 				[csharp]
 				public override Godot.Control _MakeCustomTooltip(String forText)
 				{
-				    Node tooltip = ResourceLoader.Load&lt;PackedScene&gt;("res://SomeTooltipScene.tscn").Instantiate();
+				    Node tooltip = ResourceLoader.Load&lt;PackedScene&gt;("res://some_tooltip_scene.tscn").Instantiate();
 				    tooltip.GetNode&lt;Label&gt;("Label").Text = forText;
 				    return tooltip;
 				}
diff --git a/doc/classes/DTLSServer.xml b/doc/classes/DTLSServer.xml
index 9af8be99ef..457513b8aa 100644
--- a/doc/classes/DTLSServer.xml
+++ b/doc/classes/DTLSServer.xml
@@ -8,7 +8,7 @@
 		Below a small example of how to use it:
 		[codeblocks]
 		[gdscript]
-		# ServerNode.gd
+		# server_node.gd
 		extends Node
 
 		var dtls := DTLSServer.new()
@@ -86,7 +86,7 @@
 		[/codeblocks]
 		[codeblocks]
 		[gdscript]
-		# ClientNode.gd
+		# client_node.gd
 		extends Node
 
 		var dtls := PacketPeerDTLS.new()
diff --git a/doc/classes/DisplayServer.xml b/doc/classes/DisplayServer.xml
index 5da6cf8102..832adb6e98 100644
--- a/doc/classes/DisplayServer.xml
+++ b/doc/classes/DisplayServer.xml
@@ -1694,7 +1694,10 @@
 			Use [method window_get_safe_title_margins] to determine area under the title bar that is not covered by decorations.
 			[b]Note:[/b] This flag is implemented on macOS.
 		</constant>
-		<constant name="WINDOW_FLAG_MAX" value="7" enum="WindowFlags">
+		<constant name="WINDOW_FLAG_MOUSE_PASSTHROUGH" value="7" enum="WindowFlags">
+			All mouse events are passed to the underlying window of the same application.
+		</constant>
+		<constant name="WINDOW_FLAG_MAX" value="8" enum="WindowFlags">
 			Max value of the [enum WindowFlags].
 		</constant>
 		<constant name="WINDOW_EVENT_MOUSE_ENTER" value="0" enum="WindowEvent">
diff --git a/doc/classes/EditorFileSystem.xml b/doc/classes/EditorFileSystem.xml
index e8df6ae7fe..cddf3662aa 100644
--- a/doc/classes/EditorFileSystem.xml
+++ b/doc/classes/EditorFileSystem.xml
@@ -96,6 +96,11 @@
 				Emitted if at least one resource is reloaded when the filesystem is scanned.
 			</description>
 		</signal>
+		<signal name="script_classes_updated">
+			<description>
+				Emitted when the list of global script classes gets updated.
+			</description>
+		</signal>
 		<signal name="sources_changed">
 			<param index="0" name="exist" type="bool" />
 			<description>
diff --git a/doc/classes/EditorSettings.xml b/doc/classes/EditorSettings.xml
index 98f4789163..fca87f6a56 100644
--- a/doc/classes/EditorSettings.xml
+++ b/doc/classes/EditorSettings.xml
@@ -499,7 +499,7 @@
 		</member>
 		<member name="interface/editor/editor_language" type="String" setter="" getter="">
 			The language to use for the editor interface.
-			Translations are provided by the community. If you spot a mistake, [url=https://docs.godotengine.org/en/latest/community/contributing/editor_and_docs_localization.html]contribute to editor translations on Weblate![/url]
+			Translations are provided by the community. If you spot a mistake, [url=$DOCS_URL/contributing/documentation/editor_and_docs_localization.html]contribute to editor translations on Weblate![/url]
 		</member>
 		<member name="interface/editor/expand_to_title" type="bool" setter="" getter="">
 			Expanding main editor window content to the title, if supported by [DisplayServer]. See [constant DisplayServer.WINDOW_FLAG_EXTEND_TO_TITLE].
@@ -741,7 +741,7 @@
 		</member>
 		<member name="text_editor/behavior/indent/type" type="int" setter="" getter="">
 			The indentation style to use (tabs or spaces).
-			[b]Note:[/b] The [url=https://docs.godotengine.org/en/latest/getting_started/scripting/gdscript/gdscript_styleguide.html]GDScript style guide[/url] recommends using tabs for indentation. It is advised to change this setting only if you need to work on a project that currently uses spaces for indentation.
+			[b]Note:[/b] The [url=$DOCS_URL/getting_started/scripting/gdscript/gdscript_styleguide.html]GDScript style guide[/url] recommends using tabs for indentation. It is advised to change this setting only if you need to work on a project that currently uses spaces for indentation.
 		</member>
 		<member name="text_editor/behavior/navigation/drag_and_drop_selection" type="bool" setter="" getter="">
 			If [code]true[/code], allows drag-and-dropping text in the script editor to move text. Disable this if you find yourself accidentally drag-and-dropping text in the script editor.
@@ -782,7 +782,7 @@
 			If [code]true[/code], the code completion tooltip will appear below the current line unless there is no space on screen below the current line. If [code]false[/code], the code completion tooltip will appear above the current line.
 		</member>
 		<member name="text_editor/completion/use_single_quotes" type="bool" setter="" getter="">
-			If [code]true[/code], performs string autocompletion with single quotes. If [code]false[/code], performs string autocompletion with double quotes (which matches the [url=https://docs.godotengine.org/en/latest/tutorials/scripting/gdscript/gdscript_styleguide.html]GDScript style guide[/url]).
+			If [code]true[/code], performs string autocompletion with single quotes. If [code]false[/code], performs string autocompletion with double quotes (which matches the [url=$DOCS_URL/tutorials/scripting/gdscript/gdscript_styleguide.html]GDScript style guide[/url]).
 		</member>
 		<member name="text_editor/help/class_reference_examples" type="int" setter="" getter="">
 			Controls which multi-line code blocks should be displayed in the editor help. This setting does not affect single-line code literals in the editor help.
diff --git a/doc/classes/EditorUndoRedoManager.xml b/doc/classes/EditorUndoRedoManager.xml
index cd96e740e8..4d6938e6aa 100644
--- a/doc/classes/EditorUndoRedoManager.xml
+++ b/doc/classes/EditorUndoRedoManager.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" ?>
-<class name="EditorUndoRedoManager" inherits="RefCounted" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
+<class name="EditorUndoRedoManager" inherits="Object" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
 		Manages undo history of scenes opened in the editor.
 	</brief_description>
diff --git a/doc/classes/JavaScriptBridge.xml b/doc/classes/JavaScriptBridge.xml
index 340c296eef..f79c11b334 100644
--- a/doc/classes/JavaScriptBridge.xml
+++ b/doc/classes/JavaScriptBridge.xml
@@ -5,7 +5,7 @@
 	</brief_description>
 	<description>
 		The JavaScriptBridge singleton is implemented only in the Web export. It's used to access the browser's JavaScript context. This allows interaction with embedding pages or calling third-party JavaScript APIs.
-		[b]Note:[/b] This singleton can be disabled at build-time to improve security. By default, the JavaScriptBridge singleton is enabled. Official export templates also have the JavaScriptBridge singleton enabled. See [url=$DOCS_URL/development/compiling/compiling_for_web.html]Compiling for the Web[/url] in the documentation for more information.
+		[b]Note:[/b] This singleton can be disabled at build-time to improve security. By default, the JavaScriptBridge singleton is enabled. Official export templates also have the JavaScriptBridge singleton enabled. See [url=$DOCS_URL/contributing/development/compiling/compiling_for_web.html]Compiling for the Web[/url] in the documentation for more information.
 	</description>
 	<tutorials>
 		<link title="Exporting for the Web: Calling JavaScript from script">$DOCS_URL/tutorials/export/exporting_for_web.html#calling-javascript-from-script</link>
diff --git a/doc/classes/Object.xml b/doc/classes/Object.xml
index e015bec134..a9e17f4666 100644
--- a/doc/classes/Object.xml
+++ b/doc/classes/Object.xml
@@ -24,6 +24,7 @@
 		[b]Note:[/b] The [code]script[/code] is not exposed like most properties. To set or get an object's [Script] in code, use [method set_script] and [method get_script], respectively.
 	</description>
 	<tutorials>
+		<link title="Object class introduction">$DOCS_URL/contributing/development/core_and_modules/object_class.html</link>
 		<link title="When and how to avoid using nodes for everything">$DOCS_URL/tutorials/best_practices/node_alternatives.html</link>
 		<link title="Object notifications">$DOCS_URL/tutorials/best_practices/godot_notifications.html</link>
 	</tutorials>
diff --git a/doc/classes/Plane.xml b/doc/classes/Plane.xml
index fbe8afa8d1..aa09081e3e 100644
--- a/doc/classes/Plane.xml
+++ b/doc/classes/Plane.xml
@@ -38,6 +38,7 @@
 			<param index="0" name="normal" type="Vector3" />
 			<description>
 				Creates a plane from the normal vector. The plane will intersect the origin.
+				The [param normal] of the plane must be a unit vector.
 			</description>
 		</constructor>
 		<constructor name="Plane">
@@ -46,6 +47,7 @@
 			<param index="1" name="d" type="float" />
 			<description>
 				Creates a plane from the normal vector and the plane's distance from the origin.
+				The [param normal] of the plane must be a unit vector.
 			</description>
 		</constructor>
 		<constructor name="Plane">
@@ -54,6 +56,7 @@
 			<param index="1" name="point" type="Vector3" />
 			<description>
 				Creates a plane from the normal vector and a point on the plane.
+				The [param normal] of the plane must be a unit vector.
 			</description>
 		</constructor>
 		<constructor name="Plane">
@@ -67,12 +70,6 @@
 		</constructor>
 	</constructors>
 	<methods>
-		<method name="center" qualifiers="const">
-			<return type="Vector3" />
-			<description>
-				Returns the center of the plane.
-			</description>
-		</method>
 		<method name="distance_to" qualifiers="const">
 			<return type="float" />
 			<param index="0" name="point" type="Vector3" />
@@ -80,6 +77,12 @@
 				Returns the shortest distance from the plane to the position [param point]. If the point is above the plane, the distance will be positive. If below, the distance will be negative.
 			</description>
 		</method>
+		<method name="get_center" qualifiers="const">
+			<return type="Vector3" />
+			<description>
+				Returns the center of the plane.
+			</description>
+		</method>
 		<method name="has_point" qualifiers="const">
 			<return type="bool" />
 			<param index="0" name="point" type="Vector3" />
@@ -152,7 +155,7 @@
 			In the scalar equation of the plane [code]ax + by + cz = d[/code], this is [code]d[/code], while the [code](a, b, c)[/code] coordinates are represented by the [member normal] property.
 		</member>
 		<member name="normal" type="Vector3" setter="" getter="" default="Vector3(0, 0, 0)">
-			The normal of the plane, which must be normalized.
+			The normal of the plane, which must be a unit vector.
 			In the scalar equation of the plane [code]ax + by + cz = d[/code], this is the vector [code](a, b, c)[/code], where [code]d[/code] is the [member d] property.
 		</member>
 		<member name="x" type="float" setter="" getter="" default="0.0">
diff --git a/doc/classes/RenderingServer.xml b/doc/classes/RenderingServer.xml
index 7675a37cbd..32281953b2 100644
--- a/doc/classes/RenderingServer.xml
+++ b/doc/classes/RenderingServer.xml
@@ -217,7 +217,7 @@
 			<param index="1" name="from" type="Vector2" />
 			<param index="2" name="to" type="Vector2" />
 			<param index="3" name="color" type="Color" />
-			<param index="4" name="width" type="float" default="1.0" />
+			<param index="4" name="width" type="float" default="-1.0" />
 			<param index="5" name="antialiased" type="bool" default="false" />
 			<description>
 			</description>
@@ -303,7 +303,6 @@
 			<param index="2" name="colors" type="PackedColorArray" />
 			<param index="3" name="uvs" type="PackedVector2Array" />
 			<param index="4" name="texture" type="RID" />
-			<param index="5" name="width" type="float" default="1.0" />
 			<description>
 			</description>
 		</method>
diff --git a/doc/classes/ResourcePreloader.xml b/doc/classes/ResourcePreloader.xml
index 17904697e6..5c0079f408 100644
--- a/doc/classes/ResourcePreloader.xml
+++ b/doc/classes/ResourcePreloader.xml
@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="ResourcePreloader" inherits="Node" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
-		Resource Preloader Node.
+		Preloads a list of resources inside a scene.
 	</brief_description>
 	<description>
-		This node is used to preload sub-resources inside a scene, so when the scene is loaded, all the resources are ready to use and can be retrieved from the preloader.
+		This node is used to preload sub-resources inside a scene, so when the scene is loaded, all the resources are ready to use and can be retrieved from the preloader. You can add the resources using the ResourcePreloader tab when the node is selected.
 		GDScript has a simplified [method @GDScript.preload] built-in method which can be used in most situations, leaving the use of [ResourcePreloader] for more advanced scenarios.
 	</description>
 	<tutorials>
diff --git a/doc/classes/SkeletonProfileHumanoid.xml b/doc/classes/SkeletonProfileHumanoid.xml
index 0dbd66d8d6..7445272ccc 100644
--- a/doc/classes/SkeletonProfileHumanoid.xml
+++ b/doc/classes/SkeletonProfileHumanoid.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="SkeletonProfileHumanoid" inherits="SkeletonProfile" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
 	<brief_description>
+		A humanoid [SkeletonProfile] preset.
 	</brief_description>
 	<description>
 		A [SkeletonProfile] as a preset that is optimized for the human form. This exists for standardization, so all parameters are read-only.
diff --git a/doc/classes/Transform3D.xml b/doc/classes/Transform3D.xml
index b3145ea022..90c10e3664 100644
--- a/doc/classes/Transform3D.xml
+++ b/doc/classes/Transform3D.xml
@@ -41,6 +41,7 @@
 			<return type="Transform3D" />
 			<param index="0" name="from" type="Projection" />
 			<description>
+				Constructs a Transform3D from a [Projection] by trimming the last row of the projection matrix ([code]from.x.w[/code], [code]from.y.w[/code], [code]from.z.w[/code], and [code]from.w.w[/code] are not copied over).
 			</description>
 		</constructor>
 		<constructor name="Transform3D">
diff --git a/doc/classes/Tree.xml b/doc/classes/Tree.xml
index bfabd2d97d..ff5a665bfd 100644
--- a/doc/classes/Tree.xml
+++ b/doc/classes/Tree.xml
@@ -45,11 +45,11 @@
 		<method name="create_item">
 			<return type="TreeItem" />
 			<param index="0" name="parent" type="TreeItem" default="null" />
-			<param index="1" name="idx" type="int" default="-1" />
+			<param index="1" name="index" type="int" default="-1" />
 			<description>
 				Creates an item in the tree and adds it as a child of [param parent], which can be either a valid [TreeItem] or [code]null[/code].
 				If [param parent] is [code]null[/code], the root item will be the parent, or the new item will be the root itself if the tree is empty.
-				The new item will be the [param idx]th child of parent, or it will be the last child if there are not enough siblings.
+				The new item will be the [param index]-th child of parent, or it will be the last child if there are not enough siblings.
 			</description>
 		</method>
 		<method name="deselect_all">
diff --git a/doc/classes/TreeItem.xml b/doc/classes/TreeItem.xml
index ec6b166e57..91248092d9 100644
--- a/doc/classes/TreeItem.xml
+++ b/doc/classes/TreeItem.xml
@@ -18,7 +18,7 @@
 			<param index="3" name="disabled" type="bool" default="false" />
 			<param index="4" name="tooltip_text" type="String" default="&quot;&quot;" />
 			<description>
-				Adds a button with [Texture2D] [param button] at column [param column]. The [param id] is used to identify the button. If not specified, the next available index is used, which may be retrieved by calling [method get_button_count] immediately before this method. Optionally, the button can be [param disabled] and have a [param tooltip_text].
+				Adds a button with [Texture2D] [param button] at column [param column]. The [param id] is used to identify the button in the according [signal Tree.button_clicked] signal and can be different from the buttons index. If not specified, the next available index is used, which may be retrieved by calling [method get_button_count] immediately before this method. Optionally, the button can be [param disabled] and have a [param tooltip_text].
 			</description>
 		</method>
 		<method name="call_recursive" qualifiers="vararg">
@@ -44,10 +44,10 @@
 		</method>
 		<method name="create_child">
 			<return type="TreeItem" />
-			<param index="0" name="idx" type="int" default="-1" />
+			<param index="0" name="index" type="int" default="-1" />
 			<description>
 				Creates an item and adds it as a child.
-				The new item will be inserted as position [param idx] (the default value [code]-1[/code] means the last position), or it will be the last child if [param idx] is higher than the child count.
+				The new item will be inserted as position [param index] (the default value [code]-1[/code] means the last position), or it will be the last child if [param index] is higher than the child count.
 			</description>
 		</method>
 		<method name="deselect">
@@ -60,17 +60,17 @@
 		<method name="erase_button">
 			<return type="void" />
 			<param index="0" name="column" type="int" />
-			<param index="1" name="button_idx" type="int" />
+			<param index="1" name="button_index" type="int" />
 			<description>
-				Removes the button at index [param button_idx] in column [param column].
+				Removes the button at index [param button_index] in column [param column].
 			</description>
 		</method>
 		<method name="get_button" qualifiers="const">
 			<return type="Texture2D" />
 			<param index="0" name="column" type="int" />
-			<param index="1" name="button_idx" type="int" />
+			<param index="1" name="button_index" type="int" />
 			<description>
-				Returns the [Texture2D] of the button at index [param button_idx] in column [param column].
+				Returns the [Texture2D] of the button at index [param button_index] in column [param column].
 			</description>
 		</method>
 		<method name="get_button_by_id" qualifiers="const">
@@ -91,17 +91,17 @@
 		<method name="get_button_id" qualifiers="const">
 			<return type="int" />
 			<param index="0" name="column" type="int" />
-			<param index="1" name="button_idx" type="int" />
+			<param index="1" name="button_index" type="int" />
 			<description>
-				Returns the ID for the button at index [param button_idx] in column [param column].
+				Returns the ID for the button at index [param button_index] in column [param column].
 			</description>
 		</method>
 		<method name="get_button_tooltip_text" qualifiers="const">
 			<return type="String" />
 			<param index="0" name="column" type="int" />
-			<param index="1" name="button_idx" type="int" />
+			<param index="1" name="button_index" type="int" />
 			<description>
-				Returns the tooltip text for the button at index [param button_idx] in column [param column].
+				Returns the tooltip text for the button at index [param button_index] in column [param column].
 			</description>
 		</method>
 		<method name="get_cell_mode" qualifiers="const">
@@ -113,9 +113,9 @@
 		</method>
 		<method name="get_child">
 			<return type="TreeItem" />
-			<param index="0" name="idx" type="int" />
+			<param index="0" name="index" type="int" />
 			<description>
-				Returns a child item by its index (see [method get_child_count]). This method is often used for iterating all children of an item.
+				Returns a child item by its [param index] (see [method get_child_count]). This method is often used for iterating all children of an item.
 				Negative indices access the children from the last one.
 			</description>
 		</method>
@@ -332,9 +332,9 @@
 		<method name="is_button_disabled" qualifiers="const">
 			<return type="bool" />
 			<param index="0" name="column" type="int" />
-			<param index="1" name="button_idx" type="int" />
+			<param index="1" name="button_index" type="int" />
 			<description>
-				Returns [code]true[/code] if the button at index [param button_idx] for the given [param column] is disabled.
+				Returns [code]true[/code] if the button at index [param button_index] for the given [param column] is disabled.
 			</description>
 		</method>
 		<method name="is_checked" qualifiers="const">
@@ -419,28 +419,28 @@
 		<method name="set_button">
 			<return type="void" />
 			<param index="0" name="column" type="int" />
-			<param index="1" name="button_idx" type="int" />
+			<param index="1" name="button_index" type="int" />
 			<param index="2" name="button" type="Texture2D" />
 			<description>
-				Sets the given column's button [Texture2D] at index [param button_idx] to [param button].
+				Sets the given column's button [Texture2D] at index [param button_index] to [param button].
 			</description>
 		</method>
 		<method name="set_button_color">
 			<return type="void" />
 			<param index="0" name="column" type="int" />
-			<param index="1" name="button_idx" type="int" />
+			<param index="1" name="button_index" type="int" />
 			<param index="2" name="color" type="Color" />
 			<description>
-				Sets the given column's button color at index [param button_idx] to [param color].
+				Sets the given column's button color at index [param button_index] to [param color].
 			</description>
 		</method>
 		<method name="set_button_disabled">
 			<return type="void" />
 			<param index="0" name="column" type="int" />
-			<param index="1" name="button_idx" type="int" />
+			<param index="1" name="button_index" type="int" />
 			<param index="2" name="disabled" type="bool" />
 			<description>
-				If [code]true[/code], disables the button at index [param button_idx] in the given [param column].
+				If [code]true[/code], disables the button at index [param button_index] in the given [param column].
 			</description>
 		</method>
 		<method name="set_cell_mode">
diff --git a/doc/classes/UndoRedo.xml b/doc/classes/UndoRedo.xml
index 7258efbdda..42baf7728d 100644
--- a/doc/classes/UndoRedo.xml
+++ b/doc/classes/UndoRedo.xml
@@ -17,7 +17,7 @@
 		func undo_something():
 		    pass # Put here the code that reverts what's done by "do_something()".
 
-		func _on_MyButton_pressed():
+		func _on_my_button_pressed():
 		    var node = get_node("MyNode2D")
 		    undo_redo.create_action("Move the node")
 		    undo_redo.add_do_method(self, "do_something")
diff --git a/doc/classes/Variant.xml b/doc/classes/Variant.xml
index 6b384d6a77..5416468ab6 100644
--- a/doc/classes/Variant.xml
+++ b/doc/classes/Variant.xml
@@ -38,7 +38,7 @@
 		        # To get the name of the underlying Object type, you need the `get_class()` method.
 		        print("foo is a(n) %s" % foo.get_class()) # inject the class name into a formatted string.
 		        # Note also that there is not yet any way to get a script's `class_name` string easily.
-		        # To fetch that value, you need to dig deeply into a hidden ProjectSettings setting: an Array of Dictionaries called "_global_script_classes".
+		        # To fetch that value, you can parse the [code]res://.godot/global_script_class_cache.cfg[/code] file with the [ConfigFile] API.
 		        # Open your project.godot file to see it up close.
 		[/gdscript]
 		[csharp]
@@ -70,6 +70,6 @@
 		Modifications to a container will modify all references to it. A [Mutex] should be created to lock it if multi-threaded access is desired.
 	</description>
 	<tutorials>
-		<link title="Variant class">$DOCS_URL/development/cpp/variant_class.html</link>
+		<link title="Variant class introduction">$DOCS_URL/contributing/development/core_and_modules/variant_class.html</link>
 	</tutorials>
 </class>
diff --git a/doc/classes/Window.xml b/doc/classes/Window.xml
index 4cd6cf41da..da31e6761e 100644
--- a/doc/classes/Window.xml
+++ b/doc/classes/Window.xml
@@ -527,6 +527,39 @@
 			Set's the window's current mode.
 			[b]Note:[/b] Fullscreen mode is not exclusive full screen on Windows and Linux.
 		</member>
+		<member name="mouse_passthrough" type="bool" setter="set_flag" getter="get_flag" default="false">
+			If [code]true[/code], all mouse event as passed to the underlying window of the same application. See also [member mouse_passthrough_polygon].
+			[b]Note:[/b] This property is implemented on Linux (X11), macOS and Windows.
+		</member>
+		<member name="mouse_passthrough_polygon" type="PackedVector2Array" setter="set_mouse_passthrough_polygon" getter="get_mouse_passthrough_polygon" default="PackedVector2Array()">
+			Sets a polygonal region of the window which accepts mouse events. Mouse events outside the region will be passed through.
+			Passing an empty array will disable passthrough support (all mouse events will be intercepted by the window, which is the default behavior).
+			[codeblocks]
+			[gdscript]
+			# Set region, using Path2D node.
+			$Window.mouse_passthrough_polygon = $Path2D.curve.get_baked_points()
+
+			# Set region, using Polygon2D node.
+			$Window.mouse_passthrough_polygon = $Polygon2D.polygon
+
+			# Reset region to default.
+			$Window.mouse_passthrough_polygon = []
+			[/gdscript]
+			[csharp]
+			// Set region, using Path2D node.
+			GetNode&lt;Window&gt;("Window").MousePassthrough = GetNode&lt;Path2D&gt;("Path2D").Curve.GetBakedPoints();
+
+			// Set region, using Polygon2D node.
+			GetNode&lt;Window&gt;("Window").MousePassthrough = GetNode&lt;Polygon2D&gt;("Polygon2D").Polygon;
+
+			// Reset region to default.
+			GetNode&lt;Window&gt;("Window").MousePassthrough = new Vector2[] {};
+			[/csharp]
+			[/codeblocks]
+			[b]Note:[/b] This property is ignored if [member mouse_passthrough] is set to [code]true[/code].
+			[b]Note:[/b] On Windows, the portion of a window that lies outside the region is not drawn, while on Linux (X11) and macOS it is.
+			[b]Note:[/b] This property is implemented on Linux (X11), macOS and Windows.
+		</member>
 		<member name="popup_window" type="bool" setter="set_flag" getter="get_flag" default="false">
 			If [code]true[/code], the [Window] will be considered a popup. Popups are sub-windows that don't show as separate windows in system's window manager's window list and will send close request when anything is clicked outside of them (unless [member exclusive] is enabled).
 		</member>
@@ -695,7 +728,10 @@
 			Window content is expanded to the full size of the window. Unlike borderless window, the frame is left intact and can be used to resize the window, title bar is transparent, but have minimize/maximize/close buttons. Set with [member extend_to_title].
 			[b]Note:[/b] This flag is implemented on macOS.
 		</constant>
-		<constant name="FLAG_MAX" value="7" enum="Flags">
+		<constant name="FLAG_MOUSE_PASSTHROUGH" value="7" enum="Flags">
+			All mouse events are passed to the underlying window of the same application.
+		</constant>
+		<constant name="FLAG_MAX" value="8" enum="Flags">
 			Max value of the [enum Flags].
 		</constant>
 		<constant name="CONTENT_SCALE_MODE_DISABLED" value="0" enum="ContentScaleMode">
diff --git a/doc/classes/bool.xml b/doc/classes/bool.xml
index d0ef664281..e1a98f0ea4 100644
--- a/doc/classes/bool.xml
+++ b/doc/classes/bool.xml
@@ -60,7 +60,7 @@
 		        _can_shoot = false
 		        _cool_down.start()
 
-		func _on_CoolDownTimer_timeout():
+		func _on_cool_down_timer_timeout():
 		    _can_shoot = true
 		[/gdscript]
 		[csharp]