honour the pixel depth given on the command line if we have one (make…

…s it easier to test non-24-bit rendering)

git-svn-id: https://xpra.org/svn/Xpra/trunk@26901 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/client/gl/gtk3/gl_drawing_area.py

@@ -43,7 +43,7 @@ def init_backing(self):
         self._backing = da
 
     def get_bit_depth(self, pixel_depth=0):
-        return self.context.get_bit_depth() or pixel_depth or 24
+        return pixel_depth or self.context.get_bit_depth() or 24
 
     def gl_context(self):
         b = self._backing