In Sugar, windows of Sugar-specific applications take all the screen and have no decorations.

We would like to use Metacity instead of Matchbox so regular non-Sugar applications run as well as possible inside the Sugar shell.

The problem is that Metacity is automatically fullscreen'ing all windows whose size equals the screen area:

http://git.gnome.org/cgit/metacity/tree/src/core/constraints.c#n424

This is a problem because when a window is fullscreen'ed, the application can adapt the UI to that mode (by hiding or shrinking the toolbar, for example) and because DOCK windows won't appear on top.

I'm attaching a patch that adds a command line switch to disable this behavior, but any other suggestion will be most welcome.