Bonjour Tina !
That's a very interesting question !
I've had to test myself trying the different sentences before being sure of my answer :)So the answer is: you do keep du/de la/des in such cases.
Let look at this sentence:Je n'aime pas manger du pain.
Here the negation applies to the action "manger du pain" rather than just on the object "du pain". -> you don't like "eating bread" rather than just "bread" here. Therefore it's considered as one fixed verbal group, and won't change in the negative.
I hope that's helpful!Bonne journée !
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