Fix Process.WaitForExit hang when grandchild process keeps redirected pipe open#125732

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Copilot wants to merge 8 commits intomainfrom

copilot/add-theory-to-process-waiting-tests

Commits on Mar 18, 2026

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Fix Process.WaitForExit hang when grandchild process keeps pipe open

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adamsitnik
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Fix test to use RemoteExecutor.HostRunner and RemoteExecutor.Path for grandchild process dispatch

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adamsitnik
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Use CreateProcess for grandchild process in test per reviewer feedback

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adamsitnik
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Replace magic number 300 with StreamDrainDefaultTimeoutMs const

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adamsitnik
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Move StreamDrainDefaultTimeoutMs to AsyncStreamReader, make Cancel methods parameterless, remove EOF

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adamsitnik
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Commits on Mar 19, 2026