Created attachment 197598 [details]
minimalistc C code example

The volume button shows some strange behaviour when used on quartz backend. Either it does not react to clicks on the button, or the pop-up slider immediatelly disappears when not holding down the mouse button. In all cases its indeterministic behaviour, sometimes reacting to clicks, sometimes not.

I've attached a minimalistic sample program to test the volume button. the same source compiles under linux, where everything works as expected, thats why i think the bug lies in the quartz backend.

NOTE: The bug itself is not related to the volume slider particularly, but its a definitve method to provoke the bug. I ran into this bug while trying to fix the volume slider in banshee's mac os port. Banshee currently does not use gtk's volume_button but instead its own custom widget which mimics very much the behaviour of the stock gtk volume button. After modifying banshee to use the gtk volume button instead, I noted the similiar "misbehavings" of the gtk internal volume slider - so I bet its related to quartz and not restricted to the volumeslider in particular.

Tested on Snow Leopard, using GTK 2.24.6.