Fix Output capture from background threads#4021

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MUFFANUJ wants to merge 5 commits into

jupyter-widgets:mainfrom

MUFFANUJ:outputCapture

Commits on Jun 15, 2026

Fix Output capture from background threads
MUFFANUJ
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Commits on Jun 16, 2026

Clarify Output parent request source naming
MUFFANUJ
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Commits on Jun 17, 2026

add e2e test
MUFFANUJ
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Commits on Jun 18, 2026

update tests
MUFFANUJ
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Commits on Jun 25, 2026

Pin jupyterlab version to 4.5.8
MUFFANUJ
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