[mutter] clutter: Also pick on TOUCH_BEGIN events

[Marge Bot <marge-bot src gnome org>]

commit 1922896f0712ee1ecd82549b0854cf03b47d95b3
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Tue Feb 16 09:54:41 2021 +0100

    clutter: Also pick on TOUCH_BEGIN events
    
    With 734a185915464d2da32b6b1251c8af9a631b0f8c an optimization was
    introduced to only pick on events which can actually cause the pointer
    to move. In case of touch events, the first event (TOUCH_BEGIN) will
    already move the touchpoint though, and we'll send our crossing
    CLUTTER_ENTER event to the actor this TOUCH_BEGIN happened on.
    
    So fix this embarrassing bug that caused touch input to break by also
    picking to find an event-actor on TOUCH_BEGIN events.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1733>

 clutter/clutter/clutter-main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/clutter/clutter/clutter-main.c b/clutter/clutter/clutter-main.c
index 1d62d590c6..877deeca88 100644
--- a/clutter/clutter/clutter-main.c
+++ b/clutter/clutter/clutter-main.c
@@ -1806,7 +1806,8 @@ _clutter_process_event_details (ClutterActor        *stage,
                   break;
                 }
 
-              if (event->type == CLUTTER_TOUCH_UPDATE)
+              if (event->type == CLUTTER_TOUCH_BEGIN ||
+                  event->type == CLUTTER_TOUCH_UPDATE)
                 {
                   event->any.source =
                     update_device_for_event (CLUTTER_STAGE (stage), event, TRUE);