What's New in Qt 4.5 Qt 4.5 provides many improvements and enhancements over the previous releases in the Qt 4 series. This document covers the most important features in this release, separated by category. A comprehensive list of changes between Qt 4.4 and Qt 4.5 is included in the changes-4.5.0 file available online. A list of known issues for this release is also available. Changes between th