[Webkit-unassigned] [Bug 63740] New: [Windows] Drawing Artifacts When Scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63740

           Summary: [Windows] Drawing Artifacts When Scrolling
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bfulgham at webkit.org


The attached test case triggers what seems to be a drawing bug where the web page is scrolled.

The attached HTML/CSS/JavaScript files implement a system where a particular DOM node is displayed with a semi-opaque overlay rectangle showing the region selected.  The region can cover more area than a single row, as the contents are hierarchical, so selecting the containing element causes child elements to be highlighted as a group.

When you move off of a node, the region is un-highlighted, and the new region is displayed with highlighting activated.  If you mouse over a blank area of the page, all highlighting is turned off.

Under current Safari (and nightlies), if you scroll partially down the page, then move your mouse up and down over the page I observe the following:

1. Some 'highlighted' regions are not turned off when moving off of the node.
2. Partial bits of previously highlighted regions are retained (i.e., part of a border, or most of a highlighted block with some small areas redrawn with the background color.

This looks like it might be a repainting problem, where regions are not being properly identified as 'dirty' when moving the mouse around.

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