don't try to enable alpha if the backing class does not support it

git-svn-id: https://xpra.org/svn/Xpra/trunk@8625 3bb7dfac-3a0b-4e04-842a-767bc560f471
Xpra-org · Feb 5, 2015 · e5c1ea2 · e5c1ea2
1 parent 96bb0e6
commit e5c1ea2
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/xpra/client/gtk_base/gtk_client_window_base.py b/src/xpra/client/gtk_base/gtk_client_window_base.py
@@ -202,7 +202,7 @@ def set_alpha(self):
         #by default, only RGB (no transparency):
         #rgb_formats = list(BACKING_CLASS.RGB_MODES)
         self._client_properties["encodings.rgb_formats"] = ["RGB", "RGBX"]
-        if not self._has_alpha:
+        if not self._has_alpha or not bc.HAS_ALPHA:
             self._client_properties["encoding.transparency"] = False
             return
         if self._has_alpha and not self.is_realized():