app: GimpSessionInfo: use brute force to position dialogs
Window managers are such a crap. So on top of all friendly hinting and geometry setting, simply use gtk_window_move() whenever a session managed GtkDialog is shown. It should be very hard to ignore that, but of course the WM has the last word no matter how hard we try. Note: this code should be more complex and the signal connection should happen in GimpDialogFactory. Left it in GimpSessionInfo for now until it got a bit of testing.
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