Norbert Wenzel 6c868acde1 Add const to actually override virtual functions
Parts of the Qt undo functionality were hidden instead of overriden, as
the functions were missing `const`. This adds the missing `const` to
actually override the intended function.
Also added `override` to all virtual functions to prevent future errors.
2019-10-27 16:59:21 +01:00
..
2014-08-09 09:38:16 +00:00
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