(x_scroll_bar_create): Check for width and height > 0.

(XTset_vertical_scroll_bar): Likewise.

2 files changed, 9 insertions, 5 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 05553b4c9bb..d0523eb522e 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,8 @@
 2001-11-01  Gerd Moellmann  <gerd@gnu.org>
 
+        * xterm.c (x_scroll_bar_create): Check for width and height > 0.
+        (XTset_vertical_scroll_bar): Likewise.
+
         * xfns.c (x_build_heuristic_mask): Use four_corners_best
         instead of IMAGE_BACKGROUND.
         
diff --git a/src/xterm.c b/src/xterm.c
index 706ca1463b9..83da1b5aec0 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -8956,9 +8956,10 @@ x_scroll_bar_create (w, top, left, width, height)
     /* Clear the area of W that will serve as a scroll bar.  This is
        for the case that a window has been split horizontally.  In
        this case, no clear_frame is generated to reduce flickering.  */
-    x_clear_area (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
-                  left, top, width,
-                  window_box_height (w), False);
+    if (width > 0 && height > 0)
+      x_clear_area (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
+                    left, top, width,
+                    window_box_height (w), False);
 
     window = XCreateWindow (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                             /* Position and size of scroll bar.  */
@@ -9201,7 +9202,7 @@ XTset_vertical_scroll_bar (w, portion, whole, position)
   /* Does the scroll bar exist yet?  */
   if (NILP (w->vertical_scroll_bar))
     {
-      if (width && height)
+      if (width > 0 && height > 0)
         {
           BLOCK_INPUT;
           x_clear_area (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
@@ -9233,7 +9234,7 @@ XTset_vertical_scroll_bar (w, portion, whole, position)
 
       /* Since toolkit scroll bars are smaller than the space reserved
          for them on the frame, we have to clear "under" them.  */
-      if (width && height)
+      if (width > 0 && height > 0)
         x_clear_area (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                       left, top, width, height, False);