_getFieldValue() and _setFieldValue() were using `.value` instead of
`.textContent`, so the few places that use it were getting/setting ignored
fields on divs.
fbc25834 messed up the tab index logic, shifting the responsibility for
preserving _lastTabIndex across refreshes: originally, the default was to throw
it away, and the caller was responsible for saving and restoring it if the
refresh was caused by tabbing between fields. The bad commit reversed the
situation and made the item box *remember* the _lastTabIndex by default,
meaning that a refresh caused by the notifier, for example, would focus the
last focused field even if it had been closed by the user in the meantime.
That bad change was a misguided attempt to fix the Tab key cycling infinitely
between Item Type, Title, and creators and never reaching further fields. The
actual fix was just to add `, textarea` to the query on line 1459.
cd296b1f37
