A custom divisor like 24 or 32 will result in a range containing
many divisors that are already in the `Common` and `Triplets` presets.
When this happens, it can become impossible to cycle between presets,
because the preset can only be changed if the new divisor isn't already
contained within the current preset's range.
Closes https://github.com/ppy/osu/issues/26213.
Reproduction scenario: switch audio track in editor after timeline
loads.
Happens because `beatmap.Value.Track.Length` is 0 immediately after a
track switch, until BASS computes the actual track length on the audio
thread.
Yes this is a hack. No I have no better immediate ideas how to address
this otherwise.
- Checking `DrawSize != Vector2.Zero` is too specific. It could also
crash on zero-height-but-non-zero-width, or
zero-width-but-non-zero-height.
- Take the `gridCache.Validate()` call out of the zero checks, because
even if the width or height are zero, not generating anything is valid
and there is no reason to validate every frame until `gridCache` gets
invalidated again.