STR: 1. Load a scrollable page, such as . 2. Click on the scrollbar track, away from the thumb, holding the mouse down until the thumb stops moving. Expected results: When the thumb stops moving, it's under the mouse. Actual results: When the thumb stops moving, it has overshot the mouse position and is no longer under the mouse. This was tested on Windows. On Linux, press-and-hold has a different behaviour (the thumb keeps going until the end of the scroll range), although inverting the condition of this #ifdef  causes Linux to have the Windows behaviour (including the bug).  https://bugzilla.mozilla.org/show_bug.cgi?id=1321428  http://searchfox.org/mozilla-central/rev/972b7a5149bbb2eaab48aafa87678c33d5f2f045/layout/xul/nsSliderFrame.cpp#1432
Mozregression came up with this regression range: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=daa84204a11a&tochange=dc352a7bf234 In that range, bug 957445 seems the most likely culprit. Kip, you are assigned to that bug, do you think it may have caused this?
Oh, it looks like bug 1331390 is already on file for the same issue.
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1331390
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