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[PR #4836] Allow Emoji composition to be seen in the TSF TextBlock #25978

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opened 2026-01-31 09:13:03 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:13:03 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/4836

State: closed
Merged: Yes

Summary of the Pull Request

Emoji composition was only being shown one letter at a time. This is because of the way I expected CoreTextTextUpdatingEventArgs.Range to be provided to TSFInputControl during composition (for Chinese/Japanese IME). Emoji IME composition gives the StartCaretPosition as the same as EndCaretPosition, unlike how for Chinese/Japanese IME, StartCaretPosition is usually the start of the composition and EndCaretPosition is the latest character in the composition. The solution is to change the _inputBuffer.substr() call to simply grab all of the buffer starting from _activeTextStart. This way I can ensure that I grab all of the "active text", instead of trusting the given args.Range to tell me the active text.

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Validation Steps Performed

Chinese, Japanese, Korean, Emoji composition performed. Emoji selection through pointer also performed.

**Original Pull Request:** https://github.com/microsoft/terminal/pull/4836 **State:** closed **Merged:** Yes --- <!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? --> ## Summary of the Pull Request Emoji composition was only being shown one letter at a time. This is because of the way I expected `CoreTextTextUpdatingEventArgs.Range` to be provided to TSFInputControl during composition (for Chinese/Japanese IME). Emoji IME composition gives the `StartCaretPosition` as the same as `EndCaretPosition`, unlike how for Chinese/Japanese IME, `StartCaretPosition` is usually the start of the composition and `EndCaretPosition` is the latest character in the composition. The solution is to change the `_inputBuffer.substr()` call to simply grab all of the buffer starting from `_activeTextStart`. This way I can ensure that I grab all of the "active text", instead of trusting the given `args.Range` to tell me the active text. <!-- Please review the items on the PR checklist before submitting--> ## PR Checklist * [x] Closes #4828 * [x] CLA signed. * [x] Tests added/passed <!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well --> ## Validation Steps Performed Chinese, Japanese, Korean, Emoji composition performed. Emoji selection through pointer also performed.
claunia added the pull-request label 2026-01-31 09:13:03 +00:00
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Reference: starred/terminal#25978
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