Hello @rufans!
Thank you for contributing.
The contribution is written nicely and you have explained every section in good detail, well done for that!
I admit that undo and redo are features of some importantance to this application but we expect much better, unique and original feature suggestions from our contributors.
I know you have the ability to contribute consistently with excellent ideas, all you need to do is to be unique and original while contributing. Don't suggest the features which are seen in every other similar application, by doing this, you will get a better score and of course a better reputation within the utopian.

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