I tried restructuring the hierarchy to avoid needing this added property (moving the hover layer out of the border container) but this leads to some subpixel leakage outside the borders which looks even worse. Closes #6915.
"Use `string.Contains` instead of `string.IndexOf` to improve readability"
Disable difficulty calculation for set-level difficulty icons
Due to pooling usage, there is no time we need to unload. Switching to DelayedLoadWrapper cleans up the code and reduces overhead substantially.