[Webkit-unassigned] [Bug 135106] New: Inline box culling breaks node snapshotting

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=135106

           Summary: Inline box culling breaks node snapshotting
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mitz at webkit.org
                CC: hyatt at apple.com, simon.fraser at apple.com


Created an attachment (id=235193)
 --> (https://bugs.webkit.org/attachment.cgi?id=235193&action=review)
Test case

In the test case, when you drag the first span, the drag snapshot is correct. When you drag the second span, the snapshot is empty.

The reason is that the snapshots are made by setting PaintInfo’s subtreePaintRoot to span’s RenderInline, but since the second span doesn’t have inline boxes, we never hit the (subtreePaintRoot == renderer) case in PaintInfo::updateSubtreePaintRootForChildren() when it’s called from InlineFlowBox::paint, so the subtree root is never cleared and nothing paints.

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