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[PR #12853] Fix DBCS attribute corruption during reflow #29273

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opened 2026-01-31 09:33:52 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:33:52 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/12853

State: closed
Merged: Yes

855e136 contains a regression which breaks buffer reflow if wide surrogate
characters are present. This happens because we made use of the
TextBufferCellIterator whose increment operator skips 2 cells for wide
characters. This created a "misalignment" in the reflow logic which was written
for cell-wise iteration. This commit fixes the issue, by reverting back to the
previous algorithm without iterators.

Closes #12837
Closes MSFT-38904421

Validation Steps Performed

  • Run pwsh -noprofile -command echo "`u{D83D}`u{DE43}"
  • Resizing conhost preserves all contents ✅
  • Resizing Windows Terminal doesn't crash it ✅
  • Added a test covering this issue ✅
**Original Pull Request:** https://github.com/microsoft/terminal/pull/12853 **State:** closed **Merged:** Yes --- 855e136 contains a regression which breaks buffer reflow if wide surrogate characters are present. This happens because we made use of the `TextBufferCellIterator` whose increment operator skips 2 cells for wide characters. This created a "misalignment" in the reflow logic which was written for cell-wise iteration. This commit fixes the issue, by reverting back to the previous algorithm without iterators. Closes #12837 Closes MSFT-38904421 ## Validation Steps Performed * Run ``pwsh -noprofile -command echo "`u{D83D}`u{DE43}"`` * Resizing conhost preserves all contents ✅ * Resizing Windows Terminal doesn't crash it ✅ * Added a test covering this issue ✅
claunia added the pull-request label 2026-01-31 09:33:52 +00:00
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Reference: starred/terminal#29273
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