From fe7fb168beeeaab67fad8a636fad37313c8f1416 Mon Sep 17 00:00:00 2001
From: stransky <stransky@redhat.com>
Date: Fri, 26 Nov 2021 11:34:39 +0000
Subject: [PATCH] Bug 1743095 [Linux] Check mGdkWindow state at
 is_mouse_in_window() r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D132237
---
 widget/gtk/nsWindow.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/widget/gtk/nsWindow.cpp b/widget/gtk/nsWindow.cpp
index fc87d70e79c5..07cc7cf3d4a9 100644
--- a/widget/gtk/nsWindow.cpp
+++ b/widget/gtk/nsWindow.cpp
@@ -7156,6 +7156,11 @@ MOZ_CAN_RUN_SCRIPT static void WaylandDragWorkaround(GdkEventButton* aEvent) {
 
 static bool is_mouse_in_window(GdkWindow* aWindow, gdouble aMouseX,
                                gdouble aMouseY) {
+  GdkWindow* window = aWindow;
+  if (!window) {
+    return false;
+  }
+
   gint x = 0;
   gint y = 0;
   gint w, h;
@@ -7163,8 +7168,6 @@ static bool is_mouse_in_window(GdkWindow* aWindow, gdouble aMouseX,
   gint offsetX = 0;
   gint offsetY = 0;
 
-  GdkWindow* window = aWindow;
-
   while (window) {
     gint tmpX = 0;
     gint tmpY = 0;