Add libkundo2 to Calligra
kundo2 is a fork of Qt's Undo Framework (QUndoStack, QUndoView, ...). It contains two bugfixes the are going to be available only in Qt 4.8: https://qt.gitorious.org/qt/qt/merge_requests/1212 https://qt.gitorious.org/qt/qt/merge_requests/2610 To start using kundo2, one should port Calligra to it. This can be done by adding target_link_libraries(... kundo2) into CMakeLists.txt files for all modules from Calligra that use Qt Undo Framework, and by switching from QUndo**** classes to KUndo2**** classes. (switching to KUndo2 classes can easily be done by using a script) After Calligra starts requiring Qt 4.8+, this library can be removed, because it has no advantages over Qt's Undo Framework 4.8.
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