updated for version 7.4.666

Problem:    There is a chance that Vim may lock up.
Solution:   Handle timer events differently. (Aaron Burrow)

src/os_unix.c

@@ -7096,8 +7096,16 @@ xterm_update()
 {
     XEvent event;
 
-    while (XtAppPending(app_context) && !vim_is_input_buf_full())
+    for (;;)
     {
+        XtInputMask mask = XtAppPending(app_context);
+
+        if (mask == 0 || vim_is_input_buf_full())
+	    break;
+
+        if (mask & XtIMXEvent)
+	{
+	    /* There is an event to process. */
             XtAppNextEvent(app_context, &event);
 #ifdef FEAT_CLIENTSERVER
 	    {
@@ -7110,6 +7118,12 @@ xterm_update()
 #endif
             XtDispatchEvent(&event);
         }
+	else
+	{
+	    /* There is something else than an event to process. */
+            XtAppProcessEvent(app_context, mask);
+        }
+    }
 }
 
     int

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    666,
 /**/
     665,
 /**/