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There is a weird behavior when you highlight something that has partially already been highlighted. I think you should take a look at how `preview` on osx does it. It cancels the already highlighted parts only if they are included in the new highlighted area. If an already highlighted part cross with the new highlighted area, then it will behave like it is behaving in your script.

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Thank you for your feedback. What do you mean with cancel? The script will render all selections without doing any assumptions about previous renderings and nests them. Can you give an example?

thank you :)

do you have osx? that would be easier for you to open a pdf and see how that highlight thing works.

I'll try to explain it again giving another example:

if you highlight a word, and then you highlight the entire sentence containing that world, with your script it will highlight the word with a different color, with osx it will display like you didn't highlight the word prior to this

your behavior only happens when two highlighted segments cross over, but none of them contain the other.

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