[Webkit-unassigned] [Bug 65377] New: Hidden text nodes slow down position traversing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=65377

           Summary: Hidden text nodes slow down position traversing
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P3
         Component: Text
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: yong.li.webkit at gmail.com


Created an attachment (id=102361)
 --> (https://bugs.webkit.org/attachment.cgi?id=102361&action=review)
the test case

When WebKit traverses positions, it wastes CPU time on hidden text nodes.

Open the test case in a WebKit browser, click the blank area on the left of the visible text, you will see the page doesn't respond for text selection any more. This is because WebKit is busy in traversing hidden text nodes.

The test case doesn't exist in real world. However pages with hidden text do exist in real world, and if we fix this, we could probably boost selection performance in some cases.

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