Don't clear adoptedStyleSheets when moving shadow root between document <-> template #26080
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As discussed in WICG/construct-stylesheets#133,
it should be safe to keep the adoptedStyleSheets when the shadow root
is moved between a document and a <template> within that document. We
should still clear the adoptedStyleSheets when moving a shadow root
between documents outside of that case (e.g. between iframes).
I2S: https://groups.google.com/a/chromium.org/g/blink-dev/c/W5-EGUySQgc/m/HxrySSpsBAAJ
Bug: 1111864
Change-Id: I803e75e6339f9228289188e4ed7d3f14c6e2432c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2464519
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822999}