add a UNDO function

Hi,
i really think there is a need for a UNDO function.

For example i do use a lot the "highlight text" in the snapshot of a page, and sometimes it happen that for mistake i highlight all the paragraph.

To fix it, it happen to do the same mistake and maybe unhighlight all the page, maybe a long page with several hours of time of highlighting spent on it. i didn't find a way to fix this kind of problem in the software and is kind of frustrating.

i think that being able to use a easy to implement CTRL+Z (or apple+z) function could make a lot of people happier and more productive with a little work on the coding.

what you think about it?

andrea

p.s.: I'm Italian sorry for my English!

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