MultilineTextInput: Add 'force' param to adjustSize
MultilineTextInput: Add 'force' param to adjustSize

In some cases, the widget may be populated while not visible
(e.g. while in an inactive tab) and so the size is not calculated
correctly. Users should be able to call adjustSize when the
widget comes in to view, and a 'force' param is required to
allow the valCache to be ignored.

Change-Id: I07e452765a9306aaf62cdc875db60ea18d5154d3

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