Comment 2 for bug 1539995

StacktraceTop:
 gtk_widget_translate_coordinates (src_widget=src_widget@entry=0x1ab0230, dest_widget=dest_widget@entry=0x0, src_x=src_x@entry=82, src_y=src_y@entry=77, dest_x=dest_x@entry=0x7ffcbc352bdc, dest_y=dest_y@entry=0x7ffcbc352be8) at /build/gtk+3.0-vke6KI/gtk+3.0-3.18.6/./gtk/gtkwidget.c:6121
 _update_widget_coordinates (data=0x18c16b0, gesture=0x16b0f70) at /build/gtk+3.0-vke6KI/gtk+3.0-3.18.6/./gtk/gtkgesture.c:504
 _gtk_gesture_update_point (gesture=0x16b0f70, event=<optimized out>, add=<optimized out>) at /build/gtk+3.0-vke6KI/gtk+3.0-3.18.6/./gtk/gtkgesture.c:611
 gtk_gesture_handle_event (controller=0x16b0f70, event=0x1bd58c0) at /build/gtk+3.0-vke6KI/gtk+3.0-3.18.6/./gtk/gtkgesture.c:740
 gtk_gesture_single_handle_event (controller=0x16b0f70, event=0x1bd58c0) at /build/gtk+3.0-vke6KI/gtk+3.0-3.18.6/./gtk/gtkgesturesingle.c:221