gimp's detached menus are unmovable

I do remember the menus you mean, but my version of Gimp seems to lack them. We may be handling a _NET_WM_WINDOW_STATE incorrectly. Please collect the output from "xprop" for one of the menu windows, and attach it to this bug report.

Every version of gimp has them. All you have to do to detach a menu is right click on an image (or on the main gimp window, in the newer versions of gimp) and then click on the dotted line at the top of the menu. In the following screenshot, I have circled the dotted line I'm talking about:

http://img141.imageshack.us/img141/3201/gimpmenus.png

Here is the output of xwininfo when I click on the detached menu:

http://paste.pocoo.org/show/129181

However, the title of the window that xwininfo gives me (in this case "Image Window") varies, depending on which menu I've detached. For example, if I've detached the Layers menu, the title of the window that xwininfo gives me will be "Layers".

Ooops. I just noticed that you asked for the output of xprop, not of xwininfo. Here it is:

http://paste.pocoo.org/show/129183

Thanks for that. Musca was handling _NET_WM_WINDOW_TYPE_MENU incorrectly. Revision 261 of the development tree has a patch, if you're interested to test it. https://code.launchpad.net/musca

Thanks. Looks like 261 fixed the bug.