I think this is a fantastic idea! Ensuring that small changes don’t break the link to the original document would make tracking and studying so much easier.

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I think you know about for slight edits. but I dont know about for this because this topic is not related to me and my passion. i advise to you, you can contact at any related person. hope so you will guide.

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You're right, sorry, I was confused by this behavior:
when I edit the context, e.g. add the next sentence, then the link to the original document is still shown in the flashcard review. (It's not shown during editing... well, that's the case for all contexts, not just the edited ones.) In the reading mode, when I click on the word, I get a suggestion to add the (original, unedited) context to the flashcard.

I guess you could argue this is a good thing, even though I personally find it superfluous.

Also, I think that editing the highlighted phrase itself (e.g. when the imported document contains "cd- soitin" but it should be "cd-soitin" with no extra space) leads to weird behavior: clicking the underlined word in the reading mode opens the edited flashcard, with the option to add the unedited context, which then does not contain the keyword (because the context taken from the text contains the keyword with the extra space but the keyword on the flashcard does not contain the space).