[Webkit-unassigned] [Bug 208161] New: [Frame flattening] When the iframe content schedules layout, it should also mark the owner renderer dirty

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=208161

            Bug ID: 208161
           Summary: [Frame flattening] When the iframe content schedules
                    layout, it should also mark the owner renderer dirty
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zalan at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

In the frame flattening context when optional layout is delayed, getComputedStyle() might return the un-flattened geometry unless the iframe element is forced to get laid out.

1. main frame content is loaded and laid out -> if the iframe content is not ready yet, we don't initiate iframe flattening.
2. iframe content is ready -> layout is scheduled.
3. getComputedStyle() is called which initiates a style update/layout on the main frame, but only dirty boxes trigger layout (the iframe renderer itself is not dirty <- this is where frame flattening fails)
4. getComputedStyle() returns with the "stale" geometry.

See fast/frames/flattening/iframe-tiny.html

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