With 0 delay, if the `SettingsToolboxGroup` has been contracted via
button, there's no chance to be able to expand it via button again.
This is temporary at best just to keep things working somewhat, not sure
if the expansion logic will still be required in editor redesign, so
deciding to roll with it for now.
While osu!catch also implements a distance snap grid, it doesn't rely on
`GetBeatSnapDistanceAt` (unlike osu!), therefore it can't have the
"distance spacing" multiplier yet.
Previously the slider path length would be snapped using the current
beat snap setting on *every* change of the slider path. As it turns out
this is unexpected behaviour in some situations (e.g. when reversing a
path, which is expected to preserve the previous duration, even though
the slider may be technically "unsnapped" at that point in time due to a
different beat snap setting being selected afterwards).
More specifically, if the left mouse button was just pressed without a
drag, `OnDragEnd()` wouldn't fire, and the next drag would start moving
the last placed control point around regardless of where the mouse was.