Re-done shadows to be a bit lighter and realistic
This MR re-does shadows to make them a bit lighter and more realistic, by using many gradient points and making the bottom a bit darker compared to the top.
Before: left; after: right.
To clarify what I mean with "many gradient points":
The only place where the old shadow is preserved (for now?) is widgets placed on the desktop.
When actually used, this looks like you would expect a shadow to look:
