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In the same light as removing QSGlossyBar, this removes QSBackground view, and its custom 'fancy' drawing.
Edit: removing the view was a bit premature, it is actually used by a couple of plugins. Instead, I just removed the code draws the gradient backgrounds.
It makes the Results Window more 'flat' and hopefully more 'modern':

I also properly bound the results view header/footer text colour to the appearance prefs, fixing #1235
I'm a little bit more confident that these changes may help with the Catalina/Big Sur colour problems. Less archaic code is good, right?! :D