Don't transfer window attributes trying to find the XM drag window

* src/xterm.c (xm_get_drag_window): Select for impossible event
mask instead of asking for the window attributes.

1 files changed, 8 insertions, 5 deletions

diff --git a/src/xterm.c b/src/xterm.c
index adfe3059d1d..7e8d226fb26 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -1385,7 +1385,6 @@ xm_get_drag_window (struct x_display_info *dpyinfo)
   unsigned char *tmp_data = NULL;
   Window drag_window;
   XSetWindowAttributes attrs;
-  XWindowAttributes wattrs;
   Display *temp_display;
   void *old_handler;
 
@@ -1403,8 +1402,10 @@ xm_get_drag_window (struct x_display_info *dpyinfo)
         {
           drag_window = *(Window *) tmp_data;
           x_catch_errors (dpyinfo->display);
-          XGetWindowAttributes (dpyinfo->display,
-                                drag_window, &wattrs);
+          /* We use ButtonPressMask since it's one of the events an
+             input-only window can never get.  */
+          XSelectInput (dpyinfo->display, drag_window,
+                        ButtonPressMask);
           rc = !x_had_errors_p (dpyinfo->display);
           x_uncatch_errors_after_check ();
 
@@ -1474,8 +1475,10 @@ xm_get_drag_window (struct x_display_info *dpyinfo)
          current display, and the XOpenDisplay above didn't
          accidentally connect to some other display.  */
       x_catch_errors (dpyinfo->display);
-      XGetWindowAttributes (dpyinfo->display,
-                            drag_window, &wattrs);
+      /* We use ButtonPressMask since it's one of the events an
+         input-only window can never get.  */
+      XSelectInput (dpyinfo->display, drag_window,
+                    ButtonPressMask);
       rc = !x_had_errors_p (dpyinfo->display);
       x_uncatch_errors_after_check ();
       unblock_input ();