Fix panic from tab-expansion bug in LineOverflow #6635
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LineOverflow diagnostics treated visual columns (tabs expanded) as byte offsets, so a line with tabs could produced an out-of-bounds annotation and a panic. Now emits a normal overflow diagnostic.
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LineOverflow diagnostics treated visual columns (tabs expanded) as byte offsets, so a line with tabs could produced an out-of-bounds annotation and a panic. Now emits a normal overflow diagnostic.
Fixes #6632