[Webkit-unassigned] [Bug 67100] New: REGRESSION (r93614): Safari Reader doesn’t repaint correctly when scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=67100

           Summary: REGRESSION (r93614): Safari Reader doesn’t repaint
                    correctly when scrolling
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar, Regression
          Severity: Major
          Priority: P1
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mitz at webkit.org
                CC: hyatt at apple.com, jchaffraix at webkit.org,
                    webkit-bug-importer at group.apple.com


<rdar://problem/10037421>

Two-finger scrolling in Safari Reader leads to situations where Reader’s scrollbar reaches the end of the track, but the content isn’t scrolled all the way through. Forcing a repaint (for example, by dragging to select text) reveals that the content has scrolled correctly, but just failed to repaint in its final position.

To reproduce:
1. Two-finger scroll to the bottom of an article presented in Safari Reader. It’s best if you don’t use momentum scrolling, just drag all the way.
2. Notice how the bottom of the article is not scrolled all the way up (leaving a wide black margin)
3. Drag to select text, or start scrolling in the opposite direction, or force a repaint

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