[mutter/wip/rstrode/rhel-8.0.0: 101/117] events: Don't move (sloppy) focus while buttons are pressed

[Ray Strode <halfline src gnome org>]

commit a280a6dbf3b1cd175d819f66c3d2a23d21f71cc6
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Jul 21 15:43:12 2016 +0200

    events: Don't move (sloppy) focus while buttons are pressed
    
    (https://bugzilla.redhat.com/show_bug.cgi?id=1358535)

 src/x11/events.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/src/x11/events.c b/src/x11/events.c
index f60f650a6..291b7114a 100644
--- a/src/x11/events.c
+++ b/src/x11/events.c
@@ -830,6 +830,16 @@ crossing_serial_is_ignored (MetaDisplay  *display,
   return FALSE;
 }
 
+static gboolean
+event_has_button_mask (XIEnterEvent *enter_event)
+{
+  int i;
+  for (i = 0; i < enter_event->buttons.mask_len; i++)
+    if (enter_event->buttons.mask[i] != '\0')
+      return TRUE;
+  return FALSE;
+}
+
 static gboolean
 handle_input_xevent (MetaDisplay  *display,
                      XIEvent      *input_event,
@@ -871,6 +881,7 @@ handle_input_xevent (MetaDisplay  *display,
        * avoid races.
        */
       if (window && !crossing_serial_is_ignored (display, serial) &&
+          !event_has_button_mask (enter_event) &&
           enter_event->mode != XINotifyGrab &&
           enter_event->mode != XINotifyUngrab &&
           enter_event->detail != XINotifyInferior &&