From b1d6b346626c2e6199306d45c77231e383fe54a0 Mon Sep 17 00:00:00 2001
From: Markus Sauermann <6299227+Sauermann@users.noreply.github.com>
Date: Fri, 14 Oct 2022 10:29:28 +0200
Subject: Always update Viewport's last_mosue_position

When the mouse cursor is over a embedded Window, the Viewport's
last_mouse_position did not get updated.
This patch makes sure that the update happens on every InputEventMouse.

Document canvas layer of embedded Windows.
---
 doc/classes/CanvasLayer.xml | 1 +
 scene/main/viewport.cpp     | 8 +++++---
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/doc/classes/CanvasLayer.xml b/doc/classes/CanvasLayer.xml
index 50c0860d1f..7c1b19b961 100644
--- a/doc/classes/CanvasLayer.xml
+++ b/doc/classes/CanvasLayer.xml
@@ -5,6 +5,7 @@
 	</brief_description>
 	<description>
 		Canvas drawing layer. [CanvasItem] nodes that are direct or indirect children of a [CanvasLayer] will be drawn in that layer. The layer is a numeric index that defines the draw order. The default 2D scene renders with index 0, so a [CanvasLayer] with index -1 will be drawn below, and one with index 1 will be drawn above. This is very useful for HUDs (in layer 1+ or above), or backgrounds (in layer -1 or below).
+		Embedded [Window]s are placed in layer 1024. CanvasItems in layer 1025 or above appear in front of embedded windows, CanvasItems in layer 1023 or below appear behind embedded windows.
 	</description>
 	<tutorials>
 		<link title="Viewport and canvas transforms">$DOCS_URL/tutorials/2d/2d_transforms.html</link>
diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index f7a515dc1d..f66337a2f9 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -1490,7 +1490,6 @@ void Viewport::_gui_input_event(Ref<InputEvent> p_event) {
 		gui.key_event_accepted = false;
 
 		Point2 mpos = mb->get_position();
-		gui.last_mouse_pos = mpos;
 		if (mb->is_pressed()) {
 			Size2 pos = mpos;
 			if (gui.mouse_focus_mask != MouseButton::NONE) {
@@ -1644,8 +1643,6 @@ void Viewport::_gui_input_event(Ref<InputEvent> p_event) {
 		gui.key_event_accepted = false;
 		Point2 mpos = mm->get_position();
 
-		gui.last_mouse_pos = mpos;
-
 		// Drag & drop.
 		if (!gui.drag_attempted && gui.mouse_focus && (mm->get_button_mask() & MouseButton::MASK_LEFT) != MouseButton::NONE) {
 			gui.drag_accum += mm->get_relative();
@@ -2759,6 +2756,11 @@ void Viewport::push_input(const Ref<InputEvent> &p_event, bool p_local_coords) {
 		ev = p_event;
 	}
 
+	Ref<InputEventMouse> me = ev;
+	if (me.is_valid()) {
+		gui.last_mouse_pos = me->get_position();
+	}
+
 	if (is_embedding_subwindows() && _sub_windows_forward_input(ev)) {
 		set_input_as_handled();
 		return;
-- 
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