[Webkit-unassigned] [Bug 252044] New: [GTK][WPE] Poor scrolling performance after a history navigation with PSON enabled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=252044

            Bug ID: 252044
           Summary: [GTK][WPE] Poor scrolling performance after a history
                    navigation with PSON enabled
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cgarcia at igalia.com
                CC: bugs-noreply at webkitgtk.org

With PSON, when there's a history navigation the WebPage replaces the drawing area with a new one. In case of coordinated graphics, the new drawing area ends up using the wrong display refresh monitor because DrawingArea::createDisplayRefreshMonitor() is not called. We call WebPage::windowScreenDidChange() after creating the LayerTreeHost to ensure DrawingArea::createDisplayRefreshMonitor() is called, but in this case the page is the same, and the displayID hasn't really changed. So, we need to ensure that the displayID we create is not based on WebPage unique identifier, but on DrawingArea's because the ThreadedDisplayRefreshMonitor needs to be created for every DrawingArea, not WebPage.

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