GladePlaceholder draws a completely opaque background
Submitted by Chris Lord
Link to original bug (#547441)
Description
It would be nice if GladePlaceholder either drew transparently over the parent widget, or if it could optionally not draw a background, or not draw at all. I've tried overriding the expose-event of the place-holder, but it seems it still draws.
This would be useful for containers that draw a background that can be used without containing a widget.