master a970a2a489: Make sure the X mouse position hook always looks at an X frame

[Po Lu]

branch: master
commit a970a2a48926d2eca0b767d01c809fbebdc320d7
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Make sure the X mouse position hook always looks at an X frame
    
    * src/xterm.c (XTmouse_position): Check that f1 is an X frame.
---
 src/xterm.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/xterm.c b/src/xterm.c
index 3a9f5c9ef9..d17eaf0ccc 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -5923,7 +5923,7 @@ XTmouse_position (struct frame **fp, int insist, 
Lisp_Object *bar_window,
        if (!f1 && insist > 0)
          f1 = SELECTED_FRAME ();
 
-       if (f1)
+       if (f1 && FRAME_X_P (f1))
          {
            /* Ok, we found a frame.  Store all the values.
               last_mouse_glyph is a rectangle used to reduce the
@@ -5933,7 +5933,6 @@ XTmouse_position (struct frame **fp, int insist, 
Lisp_Object *bar_window,
               on it, i.e. into the same rectangles that matrices on
               the frame are divided into.  */
 
-           /* FIXME: what if F1 is not an X frame?  */
            dpyinfo = FRAME_DISPLAY_INFO (f1);
            remember_mouse_glyph (f1, win_x, win_y, &dpyinfo->last_mouse_glyph);
            dpyinfo->last_mouse_glyph_frame = f1;