no need to initialize the buffer with zeroes, we initialize with real…

… data immediately after

git-svn-id: https://xpra.org/svn/Xpra/trunk@21691 3bb7dfac-3a0b-4e04-842a-767bc560f471

src/xpra/client/gl/gl_window_backing_base.py

@@ -1079,7 +1079,7 @@ def update_planar_textures(self, x, y, width, height, img, pixel_format, scaling
                 glTexParameteri(target, GL_TEXTURE_MAG_FILTER, mag_filter)
                 glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
                 set_texture_level()
-                glTexImage2D(target, 0, GL_LUMINANCE, width//div_w, height//div_h, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, None)
+                #glTexImage2D(target, 0, GL_LUMINANCE, width//div_w, height//div_h, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, None)
                 #glBindTexture(target, 0)        #redundant: we rebind below:
 
         self.gl_marker("updating planar textures: %sx%s %s", width, height, pixel_format)