Ryan Hunt f116107a57 Bug 1379280 - Only do async keyboard scrolling for a selection, not a focused element. r=smaug
This commit changes async keyboard scrolling to be enabled only if the content to
scroll is from a selection. This works around the problem of detecting whether
an arbitrary element has key listeners that should prevent async key scrolling,
because when they have the focus we will have disabled async key scrolling.

MozReview-Commit-ID: 6HhSuGZNsMX

--HG--
extra : rebase_source : 98a6449dd1e913136ca66532a67df8e0bb717e52
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