Possible fix for bug #14630, which continues bug #14062.

 src/w32fns.c (w32_wnd_proc): Don't call WINDOW_HEADER_LINE_HEIGHT
 unless we know that the window w's frame is a frame object.

src/ChangeLog

@@ -8,6 +8,12 @@
 	(Fadd_face_text_property): New function that calls
 	add_text_properties_1.
 
+2013-06-17  Eli Zaretskii  <eliz@gnu.org>
+
+	* w32fns.c (w32_wnd_proc): Don't call WINDOW_HEADER_LINE_HEIGHT
+	unless we know that the window w's frame is a frame object.
+	Another attempt at solving bug#14062 and bug#14630.
+
 2013-06-17  Paul Eggert  <eggert@cs.ucla.edu>
 
 	Move functions from lisp.h to individual modules when possible.

src/w32fns.c

@@ -3184,7 +3184,8 @@ w32_wnd_proc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 
 	  form.rcArea.left = WINDOW_TEXT_TO_FRAME_PIXEL_X (w, 0);
 	  form.rcArea.top = WINDOW_TOP_EDGE_Y (w);
-	  if (BUFFERP (w->contents))
+	  if (BUFFERP (w->contents)
+	      && FRAMEP (WINDOW_FRAME (w)))
 	    form.rcArea.top += WINDOW_HEADER_LINE_HEIGHT (w);
 	  form.rcArea.right = (WINDOW_BOX_RIGHT_EDGE_X (w)
 			       - WINDOW_RIGHT_MARGIN_WIDTH (w)