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[PR #7677] Fix A11y EndExclusive Error for Move & Expand #26972

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opened 2026-01-31 09:19:13 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:19:13 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/7677

State: closed
Merged: Yes

EndExclusive represents the end of the buffer. This is designed to not
point to any data on the buffer. UiaTextRange would point to this
EndExclusive and then attempt to move based on it. However, since it
does not point to any data, it could experience undefined behavior or
(inevitably) crash from running out of bounds.

This PR specifically checks for expansion and movement at that point,
and prevents us from moving beyond it. There are plans in the future to
define the "end" as the last character in the buffer. Until then, this
solution will suffice and provide correct behavior that doesn't crash.

Validation Steps Performed

Performed the referenced bugs' repro steps and added test coverage.

Closes MSFT-20458595
Closes #7663
Closes #7664

**Original Pull Request:** https://github.com/microsoft/terminal/pull/7677 **State:** closed **Merged:** Yes --- `EndExclusive` represents the end of the buffer. This is designed to not point to any data on the buffer. UiaTextRange would point to this `EndExclusive` and then attempt to move based on it. However, since it does not point to any data, it could experience undefined behavior or (inevitably) crash from running out of bounds. This PR specifically checks for expansion and movement at that point, and prevents us from moving beyond it. There are plans in the future to define the "end" as the last character in the buffer. Until then, this solution will suffice and provide correct behavior that doesn't crash. ## Validation Steps Performed Performed the referenced bugs' repro steps and added test coverage. Closes MSFT-20458595 Closes #7663 Closes #7664
claunia added the pull-request label 2026-01-31 09:19:13 +00:00
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Reference: starred/terminal#26972
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