Same bug as recently was fixed for Qt WebKit2. Since our fixed position acceleration is very similar to Qt port, we have suffered from this bug for a long time. Opt in to the Qt fix by adding PLATFORM(BLACKBERRY) to the list of platforms that want a stacking context for fixed pos...
The qt bug was https://bugs.webkit.org/show_bug.cgi?id=83980
Created attachment 139303 [details] Patch
Comment on attachment 139303 [details] Patch Clearing flags on attachment: 139303 Committed r115530: <http://trac.webkit.org/changeset/115530>
All reviewed patches have been landed. Closing bug.