1 files changed, 10 insertions, 4 deletions

diff --git a/src/xterm.h b/src/xterm.h
index 58d3dd878e0..c11f8ca713a 100644
--- a/src/xterm.h
+++ b/src/xterm.h
@@ -81,15 +81,21 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 extern XGCValues face_gc_values;                                      
 
 /* The mask of events that text windows always want to receive.  This
-   does not include mouse movement events or button release events.
-   It is used when the window is created (in x_window) and when we
-   ask/unask for mouse movement events (in XTmouse_tracking_enable).
-   */
+   does not include mouse movement events.  It is used when the window
+   is created (in x_window) and when we ask/unask for mouse movement
+   events (in XTmouse_tracking_enable).
+
+   We do include ButtonReleases in this set because elisp isn't always
+   fast enough to catch them when it wants them, and they're rare
+   enough that they don't use much processor time.  */
 
 #define STANDARD_EVENT_SET      \
   (KeyPressMask                 \
    | ExposureMask               \
    | ButtonPressMask            \
+   | ButtonReleaseMask          \
+   | PointerMotionMask          \
+   | PointerMotionHintMask      \
    | StructureNotifyMask        \
    | FocusChangeMask            \
    | LeaveWindowMask            \