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

(XTset_vertical_scroll_bar): Likewise.

diff --git a/src/xterm.c b/src/xterm.c
index 840a7ab9e43f372f9f730be25070f9779ee41dd8..6040a23ebce81d5ea38215cb4b2688c07576b231 100644 (file)
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -8942,9 +8942,10 @@ 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.  */
@@ -9187,7 +9188,7 @@ 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),
@@ -9219,7 +9220,7 @@ 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);