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diff -up firefox-60.5.0/widget/gtk/nsWindow.cpp.1196777 firefox-60.5.0/widget/gtk/nsWindow.cpp
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--- firefox-60.5.0/widget/gtk/nsWindow.cpp.1196777	2019-01-22 11:41:58.630469400 +0100
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+++ firefox-60.5.0/widget/gtk/nsWindow.cpp	2019-01-22 11:42:50.134227448 +0100
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@@ -152,7 +152,8 @@ const gint kEvents =
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 #if GTK_CHECK_VERSION(3, 4, 0)
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     GDK_SMOOTH_SCROLL_MASK | GDK_TOUCH_MASK |
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 #endif
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-    GDK_SCROLL_MASK | GDK_POINTER_MOTION_MASK | GDK_PROPERTY_CHANGE_MASK;
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+    GDK_SCROLL_MASK | 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,