Kartikaya Gupta 5a69e4f899 Bug 1378247 - Properly handle async scrollbar-dragging of RTL scrollframes. r=botond
For RTL scrollframes the scrollable rect can extend into the negative-x coordinate
space as the user can scroll leftwards from the "zero" position. The code was
assuming a zero minimum scroll position in a couple of places which broke down
on RTL scrollframes.

MozReview-Commit-ID: 5FxELpafWSD

--HG--
extra : rebase_source : a3c7614528cf59a5c60f350fca84161c8586509f
2017-07-05 15:19:09 -04:00

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