Emilio Cobos Álvarez cc5a1b6c85 Bug 1439224: Make shadow root style changes not restyle the whole document. r=xidorn
Also, make them not rebuild the CascadeData synchronously, via the
FlushSkinSheets call, since that's broken. That fixes bug 1413119.

This is a little step in getting rid of XBL usage for Shadow DOM.

MozReview-Commit-ID: HJ7FeUZlRTW

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extra : rebase_source : 0fcd0ed461856c1e87e45ef63c9e1d2e81281469
2018-02-18 14:35:57 +01:00
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