Flat effect for space graph columns (Computer)

In Prefs / Misc / Advanced options, we have gloss_and_gradients to enable gloss and gradient effects in various user interface elements.
Can you apply this to Used space (graph) and Free space (graph) columns (Computer).

Done for 12.0.9, so Windows 7 can draw flat graphs in the Computer folder if gloss_and_gradients is forced to False.

(Also the opposite, so Win8/Win10 will use gradients for those graphs if gloss_and_gradients is forced to True.)