master 080a529f7e: Don't select for gesture events on xwidgets if the server is too old

[Po Lu]

branch: master
commit 080a529f7e9c1a750f39d92f1e8f1e7170d6fb81
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Don't select for gesture events on xwidgets if the server is too old
    
    * src/xwidget.c (x_draw_xwidget_glyph_string): Only select for
    XI gesture events if the server supports XI 2.4 or later.
---
 src/xwidget.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/xwidget.c b/src/xwidget.c
index 4f14152833..36f216d939 100644
--- a/src/xwidget.c
+++ b/src/xwidget.c
@@ -2247,9 +2247,12 @@ x_draw_xwidget_glyph_string (struct glyph_string *s)
          XISetMask (m, XI_Enter);
          XISetMask (m, XI_Leave);
 #ifdef XI_GesturePinchBegin
-         XISetMask (m, XI_GesturePinchBegin);
-         XISetMask (m, XI_GesturePinchUpdate);
-         XISetMask (m, XI_GesturePinchEnd);
+         if (FRAME_DISPLAY_INFO (s->f)->xi2_version >= 4)
+           {
+             XISetMask (m, XI_GesturePinchBegin);
+             XISetMask (m, XI_GesturePinchUpdate);
+             XISetMask (m, XI_GesturePinchEnd);
+           }
 #endif
          XISelectEvents (xv->dpy, xv->wdesc, &mask, 1);
        }