This is an upstream bug is is caused by the change made to fix https://bugzilla.gnome.org/show_bug.cgi?id=482354 like you initially thought. The message there says to open a new bug if you disagree with the change so I guess the next step is to open a new upstream bug report.
-- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is a bug assignee. https://bugs.launchpad.net/bugs/213432 Title: gtk_window.present() doesn't work if the window is already on another desktop -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs