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A wide glyph's tail column is never painted or compared, and prev never
learned it either. Overwrite the head later and the terminal blanks the
tail cell -- but if that column's new content matches the stale prev, the
diff skips it, leaving a one-cell hole where the glyph's second half was.
Seen as a missing rule cell in a pane's top border after spawning a new
tab: the old tab's centered title started with a wide glyph, the new
tab's border put the rule back, and the tail column stayed blank.
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