[Webkit-unassigned] [Bug 45586] New: Having an empty listener to beforeload events changes the behavior of other scripts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=45586

           Summary: Having an empty listener to beforeload events changes
                    the behavior of other scripts
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://odyniec.net/projects/imgzoom/
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: marc.hoyois at gmail.com


Created an attachment (id=67292)
 --> (https://bugs.webkit.org/attachment.cgi?id=67292)
A trivial Safari extension reproducing the bug

Overview:

Simply registering a beforeload event listener in an injected script breaks the imgZoom jQuery plugin.

Steps to reproduce:
1. Install the attached extension (and disable any other extension if you wish). It has the following trivial code in an injected script:

document.addEventListener("beforeload", function(){}, true);

2. Navigate to http://odyniec.net/projects/imgzoom/

3. Click on one of the three images. The image should enlarge.

4. Reload the page manually.

5. Click on the same image again.

Actual result:
The image shrinks.

Expected result:
The image should be enlarged as in step 3.

Platform:
Tested on OS X 10.6.4 with both Safari 5.0.2 and Webkit 6533.18.5, r67077

Note:
Theoretically, this extension should have no effect whatsoever. The same bug happens with nontrivial event handlers.

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