Created attachment 361957 [details]
A reference image of  how mutter behaves,

The menus of gtk2 apps look fine with mutter.

Ah, the title also seems a little off in metacity.

BTW I also noticed that all windows get styled as they were CSD windows, but I have no idea if the menu theming bug is related to this new behavior.

the following theme snippet used to work the same in metacity and mutter, producing different borders between CSD and SSD windows, but now it does not work as it used to in metacity:

/* Yellow  border */
decoration {
  box-shadow: 0 3px 9px 1px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 255, 0, 0.8);
}

decoration:backdrop {
  box-shadow: 0 3px 9px 1px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(255, 255, 0, 0.3);
}

/* Magenta border */
.ssd decoration {
  box-shadow: 0 0 0 1px rgba(255, 0, 255, 0.8);
}
.ssd decoration:backdrop {
  box-shadow: 0 0 0 1px rgba(255, 0, 255, 0.3);
}

The problem here is that gtk+ 2 does not add shadow and it should be added by metacity. I will try to fix that.

Different borders I don't consider as bug, it is intended behaviour. Why would you want different borders?

.ssd was added because mutter has it own shadows and without it you would get csd shadow + mutter shadow. To avoid that .ssd was added to allow themes to remove shadow so you only get shadow from mutter.

(In reply to Alberts Muktupāvels from comment #3)
[...]
> Different borders I don't consider as bug, it is intended behaviour. Why
> would you want different borders?
> 
> .ssd was added because mutter has it own shadows and without it you would
> get csd shadow + mutter shadow. To avoid that .ssd was added to allow themes
> to remove shadow so you only get shadow from mutter.

Not that I actually want to have different borders, I was just surprised that the behavior changed, that's all.

Now I know that it's deliberate and that there should be no side effects of the new behavior.

Thanks again,
   Antonio

Should be fixed. Now also GTK+ 2 app menus should have menus.