i am dealing with the same problem... as a workaround you can take a look at e4-dark_partstyle.css file and make the background a little bit darker so the selection is visible. the key here is to know what element to modify. i have changed the background-color of a bunch of elements (including the one i think is related to package and project explorers, called tree) from #2f2f2f to #171717.

hope it helps.

css modification

original: original

modified: modified

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