[Webkit-unassigned] [Bug 77811] New: auto-margin-centered block does not update when parent's padding-right changes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=77811

           Summary: auto-margin-centered block does not update when
                    parent's padding-right changes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Major
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kaiser.yann at gmail.com


Created an attachment (id=125498)
 --> (https://bugs.webkit.org/attachment.cgi?id=125498&action=review)
Test case

Consider the following:
* A block, let's call it container is positioned relatively.
* Inside it, we center horizontally another block using auto margins.
* We set padding-right on the container to a positive value
* The inner block is expected to shift to the left. It does not in WebKit.

The error is present in the r106740 nightly build of WebKit and in Chromium 16.0.912.77.
Firefox displays the inner block shifted to the left as expected.

The bug does not happen when changing padding-left.

Attached is a test case. For your convenience I hosted it on a web server here:
http://epsy.net46.net/stuff/webkit-margins-not-updating.html

If your browser/window manager allows it, you can try switching to the inspector while hovering. The inner box updates to the correct position if you change the selection in the Elements tab.

Another workaround I found was to also set a margin. Setting padding-left instead has no other effect than its own.

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