Render TUI composer tabs as single-column spaces - #33239
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## Why Tabs in composer text could render at a different width from the cursor and wrapping calculations, causing misaligned cursors and unexpected line breaks. ## What changed - Replace tabs with single-column spaces for wrapping and rendering while preserving the original editable text and byte ranges. - Apply the same display representation to base text, styled elements, and highlighted ranges. ## Testing Add coverage for cursor alignment, rendered output, and wrapping of text that contains tabs. GitOrigin-RevId: 06d8489621d2f8b0823c7a004079d152dd0cab66
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Render TUI composer tabs as single-column spaces
Why
Tabs in composer text could render at a different width from the cursor and
wrapping calculations, causing misaligned cursors and unexpected line breaks.
What changed
preserving the original editable text and byte ranges.
highlighted ranges.
Testing
Add coverage for cursor alignment, rendered output, and wrapping of text that
contains tabs.