I encountered this Bug on www.gmx.de (a rather big Free-Mail provider in Germany) and only found one posting on webkit-qt concerning this issue. As I didn't find a bug report about this, I simply create one.
The original posting on the mailing list includes a small test program which causes the bug: https://lists.webkit.org/pipermail/webkit-qt/2010-August/000766.html
Kenneth, ever heard of this?
(In reply to comment #1)
> Kenneth, ever heard of this?
No never, but we could look at it next week. We are having other issues with content size change events.
=== Bulk closing of Qt bugs ===
If you believe that this bug report is still relevant for a non-Qt port of webkit.org, please re-open it and remove [Qt] from the summary.
If you believe that this is still an important QtWebKit bug, please fill a new report at https://bugreports.qt-project.org and add a link to this issue. See http://qt-project.org/wiki/ReportingBugsInQt for additional guidelines.