[gtk/fix-tooltip-trigger] Fix tooltip triggering

[Matthias Clasen <matthiasc src gnome org>]

commit b30715da6a6436fd4fd89c4aa25cc961112f5579
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Nov 15 09:34:25 2020 -0500

    Fix tooltip triggering
    
    Ever since 5b5d2665d373c35f, tooltips don't work properly,
    since we get more motion events now, and those keep the
    tooltips from appearing. This can be seen e.g. on the icon
    in the password entry in widget-factory, or on the section
    switcher buttons in the Emoji chooser.
    
    Ignore synthetic motion events for the purposes of
    determining whether the user moved the mouse.

 gtk/gtktooltip.c | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/gtk/gtktooltip.c b/gtk/gtktooltip.c
index 73c54cd6b0..392bd0620e 100644
--- a/gtk/gtktooltip.c
+++ b/gtk/gtktooltip.c
@@ -917,6 +917,11 @@ _gtk_tooltip_handle_event (GtkWidget *target,
   surface = gdk_event_get_surface (event);
   gdk_event_get_position (event, &x, &y);
 
+  /* ignore synthetic motion events */
+  if (event_type == GDK_MOTION_NOTIFY &&
+      gdk_event_get_time (event) == GDK_CURRENT_TIME)
+    return;
+
   gtk_native_get_surface_transform (native, &nx, &ny);
   gtk_widget_translate_coordinates (GTK_WIDGET (native), target, x - nx, y - ny, &x, &y);
   gtk_tooltip_handle_event_internal (event_type, surface, target, x, y);