It should be large enough to account for true accuracy
but small enough to disregard any hair-thin inaccuracy found
at the very end of the float value.
Instead of checking the master and music volumes separately to
see if they're <= 1%, check the aggregate of the two volumes to
see if it's <= -60 dB.
When muted notification is activated, restore the aggregate volume
level to -30 dB.
I have more thoughts on this warning in general (which will likely see
it removed or moved in the future) but this seems like a quick QOL fix
for now.
As mentioned in https://github.com/ppy/osu/discussions/22861.
It is impossible for the callback passed to `ApplyToBackground()` to
receive a null reference. See `OsuScreen.ApplyToBackground()` - if the
background to call the callback on were `null`, then an
`InvalidOperationException` would be thrown instead.
This always looked weird, and from the looks of the structure was
probably unintentional from the start (it is in the logo tracking
container for whatever reason).