Documentation quick search misses classes

The autocompletion for the documentation quick search (the "search docs" box below the tag listing on the right column) is missing classes. For example: QIdentityProxyModel. It seems as if all the classes that have been added in 4.8 are not listed there.

Best solution for the future would be to have the autocompletion list based on the Qt version that the user selected, so that in 4.7 QIdentityProxyModel is not listed, while in 4.8 it is listed.