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[PR #9729] Resolve circular reference in ThrottledFunc #27716

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opened 2026-01-31 09:23:46 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:23:46 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/9729

State: closed
Merged: Yes

Summary of the Pull Request

ThrottledFunc previously created a DispatcherTimer whose Tick callback holds a strong reference to the DispatcherTimer itself.
This causes a reference cycle, inadvertently leaking timer instances.

PR Checklist

Detailed Description of the Pull Request / Additional comments

I've initially wanted to remove the ThrottledFunc<> optimization, but it turns out that this causes a 3% slowdown. That's definitely not a lot, but enough that we can just keep the optimization for the time being.
I've moved the implementation from the .cpp file into the header regardless since the two implementations are extremely similar and it's easier that way to keep them in line.

Validation Steps Performed

I've ensured that the scrollbar still updates its length when I add new lines to a newly created tab.

**Original Pull Request:** https://github.com/microsoft/terminal/pull/9729 **State:** closed **Merged:** Yes --- ## Summary of the Pull Request ThrottledFunc previously created a DispatcherTimer whose Tick callback holds a strong reference to the DispatcherTimer itself. This causes a reference cycle, inadvertently leaking timer instances. ## PR Checklist * [x] Closes #7710 * [x] I work here ## Detailed Description of the Pull Request / Additional comments I've initially wanted to remove the `ThrottledFunc<>` optimization, but it turns out that this causes a 3% slowdown. That's definitely not a lot, but enough that we can just keep the optimization for the time being. I've moved the implementation from the .cpp file into the header regardless since the two implementations are extremely similar and it's easier that way to keep them in line. ## Validation Steps Performed I've ensured that the scrollbar still updates its length when I add new lines to a newly created tab.
claunia added the pull-request label 2026-01-31 09:23:46 +00:00
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Reference: starred/terminal#27716
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