TextInputWidget: Only call #onElementAttach on focus if it wasn't called
TextInputWidget: Only call #onElementAttach on focus if it wasn't called

Change-Id: Id8a2b9c9a0757215995a1b51bf2d132a2e15a9bc

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui