Comment 2 for bug 550750

This is a big deal for me... but I don't see the doc you linked referering to that. It particular, it talks about applications hiding themselves from appearing in the messaging menu, but never about hiding the application window itself, nor about minimizing windows.

Empathy implements this by minimizing to the indicator when a close button is pressed. This is requested for xchat under https://bugs.launchpad.net/xchat-indicator/+bug/474906