[Webkit-unassigned] [Bug 218777] New: ContentfulPaintChecker should not trigger plugin snapshotting

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218777

            Bug ID: 218777
           Summary: ContentfulPaintChecker should not trigger plugin
                    snapshotting
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

This can happen:

    +                     2610 WebCore::Page::updateRendering()  (in WebCore) + 1102  [0x1099c501e]
    +                       2610 WebCore::Page::forEachDocument(WTF::Function<void (WebCore::Document&)> const&) const  (in WebCore) + 366  [0x1099be51e]
    +                         2610 WebCore::Document::enqueuePaintTimingEntryIfNeeded()  (in WebCore) + 208  [0x10938a9e0]
    +                           2610 WebCore::ContentfulPaintChecker::qualifiesForContentfulPaint(WebCore::FrameView&)  (in WebCore) + 259  [0x109c46273]
    +                             2610 WebCore::ScrollView::paint(WebCore::GraphicsContext&, WebCore::IntRect const&, WebCore::Widget::SecurityOriginPaintPolicy, WebCore::EventRegionContext*)  (in WebCore) + 1039  [0x109a6161f]
    +                               2610 WebCore::FrameView::paintContents(WebCore::GraphicsContext&, WebCore::IntRect const&, WebCore::Widget::SecurityOriginPaintPolicy, WebCore::EventRegionContext*)  (in WebCore) + 760  [0x1099a6788]
    +                                 2610 WebCore::FrameView::willPaintContents(WebCore::GraphicsContext&, WebCore::IntRect const&, WebCore::FrameView::PaintingState&)  (in WebCore) + 447  [0x1099a6baf]
    +                                   2610 WebKit::PluginView::notifyWidget(WebCore::WidgetNotification)  (in WebKit) + 134  [0x106501f0a]
    +                                     2610 WebKit::PDFPlugin::snapshot()  (in WebKit) + 297  [0x1069433d7]
    +                                       2610 -[PDFLayerController snapshotInContext:]  (in PDFKit) + 1753  [0x7fff3ebf963b]
    +                                         2610 -[PDFPage drawWithBox:toContext:]  (in PDFKit) + 141  [0x7fff3ec34edd]

Plugin snapshotting here is just a waste of cycles.

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