Another attempt to solve bug #14062 with assertion violations on MS-Windows.

 src/w32fns.c (w32_wnd_proc): Don't call WINDOW_HEADER_LINE_HEIGHT
 unless we know that the window w is a leaf window.  Another
 attempt at solving bug#14062.

2 files changed, 9 insertions, 2 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index db766c78e6c..d7778e3a524 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,9 @@
+2013-05-14  Eli Zaretskii  <eliz@gnu.org>
+
+        * w32fns.c (w32_wnd_proc): Don't call WINDOW_HEADER_LINE_HEIGHT
+        unless we know that the window w is a leaf window.  Another
+        attempt at solving bug#14062.
+
 2013-05-14  Jan Djärv  <jan.h.d@swipnet.se>
 
         * nsfont.m (ns_spec_to_descriptor): Retain and autorelease
diff --git a/src/w32fns.c b/src/w32fns.c
index 66581341478..d7ac0dd1a6c 100644
--- a/src/w32fns.c
+++ b/src/w32fns.c
@@ -3183,8 +3183,9 @@ w32_wnd_proc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
           form.ptCurrentPos.y = w32_system_caret_y;
 
           form.rcArea.left = WINDOW_TEXT_TO_FRAME_PIXEL_X (w, 0);
-          form.rcArea.top = (WINDOW_TOP_EDGE_Y (w)
-                             + WINDOW_HEADER_LINE_HEIGHT (w));
+          form.rcArea.top = WINDOW_TOP_EDGE_Y (w);
+          if (BUFFERP (w->contents))
+            form.rcArea.top += WINDOW_HEADER_LINE_HEIGHT (w);
           form.rcArea.right = (WINDOW_BOX_RIGHT_EDGE_X (w)
                                - WINDOW_RIGHT_MARGIN_WIDTH (w)
                                - WINDOW_RIGHT_FRINGE_WIDTH (w));