A possible solution if we are willing to give up some functionality is to avoid triggering the quick actions when there is a space before the slash.
I guess mean the opposite: avoid triggering the quick actions when there is NOT a space before the slash.
Another option would to ask 2 key combinations to trigger the quick actions (like ctrl+/).
I can clearly envision typing "... whether he / she will do this...". Typing "/" in a sentence is not so uncommon. For sure, mandating a space before would already remove a lot of false positive cases (like typing a computer path).
Maybe the best for now would be to:
Mandate a space
Have another way to trigger the quick action if you want to trigger it in a case where there's no space before, using for ex ctrl+/ or some other key combination
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