When modifying an UntitledStringMenuItem, update the value immediately upon it being changed, rather than waiting until editing "finished" (i.e. the user presses enter).
When modifying an UntitledStringMenuItem, update the value immediately upon it being
changed, rather than waiting until editing "finished" (i.e. the user presses enter).

This is neeeded so that when editing table properties, if the user changes the text in the
caption field and immediately pressed close, the table caption will still have been
updated. In fact the caption is now updated in real time.

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