[Webkit-unassigned] [Bug 209232] New: On PSON, WebPageProxy listens to two DrawAreaProxy at the same time

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=209232

            Bug ID: 209232
           Summary: On PSON, WebPageProxy listens to two DrawAreaProxy at
                    the same time
           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: youennf at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

When PSONing, a web page proxy listens to two DrawingAreaProxy.
While this may not be an issue when everything is working and rendering is properly suspended in WebProcess, this is fragile design, as shown by regression in https://bugs.webkit.org/show_bug.cgi?id=208918.

It seems that, ideally, when the provisional DrawingAreaProxy starts receiving some messages, WebPageProxy should stop listening to the old one.
Or maybe do some processing that ensures that rendering is swapped at the exact time draw area proxies are swapped.

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