[Webkit-unassigned] [Bug 35216] New: Web Inspector: REGRESSION: hangs when scrolling in Resource panes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=35216

           Summary: Web Inspector: REGRESSION: hangs when scrolling in
                    Resource panes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://www.youtube.com/watch?v=jqxENMKaeCU
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: opendarwin at lapcatsoftware.com


Created an attachment (id=49163)
 --> (https://bugs.webkit.org/attachment.cgi?id=49163)
Samples of Safari

Overview:
There is a performance regression in the Resources pane of the Web Inspector
from stock Safari 4.0.4 (6531.21.10) on Mac OS X 10.6.2 to WebKit TOT (r55052).
Scrolling in the source of a large javascript file, for example, is very slow
and can cause the Web Inspector and Safari to hang.

Steps to Reproduce:
1) Launch Terminal
2) WebKit/WebKitTools/Scripts/run-safari
3) Open http://www.youtube.com/watch?v=jqxENMKaeCU
4) Show Web Inspector
5) Select Resources pane
6) Enable resource tracking for this session, if not enabled
7) Select www-core-new-vfl147421.js in the resources list
8) Scroll up and down in the js source

Actual Results:
Scrolling is instantaneous.

Expected Results:
Scrolling is slow and causes Safari to hang and pinwheel.

Build Date & Platform:
WebKit svn r55052 built from source, Debug configuration, Mac OS X 10.6.2 Build
10C540, Xcode 3.2.1

Additional Information:
What seems to be happening is that the web inspector is continuously performing
syntax highlighting. It syntax highlights the section at the top, then when I
scroll down the text is all black, it syntax highlights, but when I scroll back
to the top, the formerly highlighted text is now all black again, and then it
gets syntax highlighted again.

This problem occurs whether or not I have ClickToFlash installed, so it has
nothing to do with whether there is actually a Flash movie playing on the web
page.

Attached are two samples of Safari, archived in the file
"InspectorSamples.zip".

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