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Reuse and prewarm the WSL clipboard text reader - #52967
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## Why WSL clipboard reads previously launched PowerShell for every paste. Process creation can hang under WSL and stall the shared clipboard worker. ## What changed - Reuse a persistent PowerShell reader on a dedicated thread, keeping clipboard requests bounded by their deadlines and restarting the reader after errors. - Prewarm the reader at startup when right-click paste is allowed on WSL, without accessing clipboard contents. - Use length-framed UTF-8 responses to preserve whitespace and distinguish consecutive pastes while enforcing message size limits. ## Testing Update the command-reader test to cover consecutive responses from one process, large clipboard text, UTF-8 and whitespace preservation, and read timeouts. GitOrigin-RevId: 36af338097d6b178ab4887faa5918240c47e1515
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Reuse and prewarm the WSL clipboard text reader
Why
WSL clipboard reads previously launched PowerShell for every paste. Process creation can hang under WSL and stall the shared clipboard worker.
What changed
Testing
Update the command-reader test to cover consecutive responses from one process, large clipboard text, UTF-8 and whitespace preservation, and read timeouts.