Docked Widget Custom Resize
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There's been a "request":https://bugreports.qt-project.org/browse/QTBUG-14667 for this in the past but it seems long forgotten.
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You don't need to buy a license to modify Qt source code.
Here is a "repository":https://qt.gitorious.org/qt
or "source code for 5.3 beta":http://download.qt-project.org/development_releases/qt/5.3/5.3.0-alpha/single/ -
[quote author="andreyc" date="1396671203"]You don't need to buy a license to modify Qt source code.
Here is a "repository":https://qt.gitorious.org/qt
or "source code for 5.3 beta":http://download.qt-project.org/development_releases/qt/5.3/5.3.0-alpha/single/
[/quote]But if you do, depending on the license you choose, you should make your alterations open source.
Please read the Qt licenses first to be sure about what you can or can't. We are not lawyers here.