Fix StreamWriter keeps working after being disposed if `leaveOpen: true` is used - #125189

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ViveliDuCh wants to merge 4 commits into

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ViveliDuCh:fix/streamwriter-dispose-leaveopen-89646

Commits on Mar 4, 2026

Fix StreamWriter not throwing after Dispose with leaveOpen: true, mirroring the StreamReader.Dispose pattern. Add tests for Dispose and DisposeAsync with leaveOpen: true, plus a StreamReader parit…
ViveliDuCh
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fcdb75a
Address PR feedback
ViveliDuCh
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9a4ba2b

Commits on Mar 5, 2026

Address test failure.
ViveliDuCh
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548b3e6

Commits on Mar 9, 2026

Address PR feedback: Test fix
ViveliDuCh
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ce74052