[Webkit-unassigned] [Bug 47047] New: designMode frame slows to a crawl in some circumstances

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=47047

           Summary: designMode frame slows to a crawl in some
                    circumstances
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://marijn.haverbeke.nl/upload/webkit_slow.html
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: marijnh+webkit at gmail.com


On the linked page, a designMode frame is created and filled with lots of span and br nodes. If you put the cursor at the end of any of the lines in the frame and type something, it takes up to three seconds for the text to appear. Typing in the middle of a line is responsive as normal. Using a small document or setting the whiteSpace style to "nowrap" removes the problem.

This test case is intended to simulate the kind of editable frame created by CodeMirror (http://codemirror.net) which has suffered from very bad performance in recent Safari and Chrome versions.

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