Songs in strange tunings

Wasn't exactly sure which flair would be best for this question, but it's sort of about fingering and sort of about tuning

So I was listening to this song by Geese earlier, and just casually plucking my violin when I noticed their instruments were tuned a quarter step down, so they were playing somewhere between A major and Ab major

This got me thinking, how would you deal with a situation like as a violinist? Would you tune down a quarter step or just change your fingering?