[mutter] frame: Only select for ButtonPress/Release/Motion/Crossing

[Jasper St. Pierre <jstpierre src gnome org>]

commit 7b0930f79813ac93b4020fb28bf6c4bc564e1043
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Jun 19 21:15:14 2014 +0200

    frame: Only select for ButtonPress/Release/Motion/Crossing
    
    Touch events are largely ignored on GdkEvent emulation, so only
    make frames receive pointer events, only the pointer emulating
    touch will be reported, and any other further touches will be
    ignored, which is about the behavior we want. This makes window
    dragging possible again on touch.

 src/core/frame.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/src/core/frame.c b/src/core/frame.c
index 0895241..f80148f 100644
--- a/src/core/frame.c
+++ b/src/core/frame.c
@@ -109,6 +109,19 @@ meta_window_ensure_frame (MetaWindow *window)
   XChangeWindowAttributes (window->display->xdisplay,
                           frame->xwindow, CWEventMask, &attrs);
 
+  {
+    unsigned char mask_bits[XIMaskLen (XI_LASTEVENT)] = { 0 };
+    XIEventMask mask = { XIAllMasterDevices, sizeof (mask_bits), mask_bits };
+
+    XISetMask (mask.mask, XI_ButtonPress);
+    XISetMask (mask.mask, XI_ButtonRelease);
+    XISetMask (mask.mask, XI_Motion);
+    XISetMask (mask.mask, XI_Enter);
+    XISetMask (mask.mask, XI_Leave);
+
+    XISelectEvents (window->display->xdisplay, frame->xwindow, &mask, 1);
+  }
+
   meta_display_register_x_window (window->display, &frame->xwindow, window);
 
   meta_error_trap_push (window->display);