macosx: fix window ordering during startup (close #14486)
According to docu, application:willFinishLaunching: will be called as one of the first steps of [NSApp run], before the main loop will be actually started. Thus, it should make no performance difference if we load the main window already in openIntf(). For some unknown reasons, a direct call to makeKeyAndOrderFront works in run(), but not in app:willFinishLaunching:, though.
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