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diff -up firefox-100.0/widget/gtk/nsWindow.cpp.1196777 firefox-100.0/widget/gtk/nsWindow.cpp
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--- firefox-100.0/widget/gtk/nsWindow.cpp.1196777	2022-05-02 11:29:06.763325015 +0200
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+++ firefox-100.0/widget/gtk/nsWindow.cpp	2022-05-02 11:30:49.100717334 +0200
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@@ -163,7 +163,8 @@ const gint kEvents = GDK_TOUCHPAD_GESTUR
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                      GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK |
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                      GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
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                      GDK_SMOOTH_SCROLL_MASK | GDK_TOUCH_MASK | GDK_SCROLL_MASK |
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-                     GDK_POINTER_MOTION_MASK | GDK_PROPERTY_CHANGE_MASK;
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+                     GDK_POINTER_MOTION_MASK | GDK_PROPERTY_CHANGE_MASK |
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+                     GDK_FOCUS_CHANGE_MASK;
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 /* utility functions */
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 static bool is_mouse_in_window(GdkWindow* aWindow, gdouble aMouseX,