[Lazarus] Undo/Redo in Form Designer

[Александр С.]

Hi !
I'm doing a undo/redo-system for form designer (
bugs.freepascal.org/view.php?id=22584). This is not the final version now.
I post the patches, and each next patch contains more features than the
previous one. My code is not perfect, but I'm working on it :)
Can any of responsible developers to write a feedback about my work (then I
will know that I am doing the right thing)? Thanks.
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