- height_adjust: if true, reduce height to a multiple of
line_height (for nicer centering)
- height_overflow_show_ellipsis: if height overflow, append
ellipsis to last shown line
(Implemented in both use_xtext and legacy code path.)
Use them in Menu.lua to clean up/shorten the code used for multiline
menu items by delegating the work to TextBoxWidget, or using
TextWidget when we end up needing only a single line.
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