[css-highlight-api-1] Don't paint ranges positioned in a different window #6417 #6499
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Specify that when painting a document, the associated
HighlightRegistry
's ranges that are positioned in a different document are not painted.Also, fix a bug: the "no longer in a document tree" check excluded ranges positioned inside a shadow tree, which is probably not what we want. Using the shadow-including root instead fixes this.
Closes #6417.