compositor: Shaded windows have no heightxfce-4.12

Bug: 14899

Trying to get the pixmap  with a height of zero will lead to an XError
and further trouble down the line.

Signed-off-by: Olivier Fourdan <fourdan@xfce.org>
(cherry picked from commit 8cd915228bafb9792fd5d3e7e778db8ed51578d1)

1 files changed, 6 insertions, 0 deletions

diff --git a/src/compositor.c b/src/compositor.c
index 5a7b7e0d2..fca15aed3 100644
--- a/src/compositor.c
+++ b/src/compositor.c
@@ -2956,6 +2956,12 @@ compositorScaleWindowPixmap (CWindow *cw, guint *width, guint *height)
     }
     src_size = MAX (src_w, src_h);
 
+    /* Shaped windows have no height */
+    if (src_w == 0 || src_h == 0)
+    {
+        return None;
+    }
+
     /*/
      * Caller may pass either NULL or 0.
      * If 0, we return the actual unscalled size.