Closes https://github.com/ppy/osu/issues/28369.
The reporter of the issue was incorrect; it's not the beat snap grid
that is causing the problem, it's something far stupider than that.
When the current selection changes,
`EditorSelectionHandler.UpdateTernaryStates()` is supposed to update the
state of ternary bindables to reflect the reality of the current
selection. This in turn will fire bindable change callbacks for said
ternary toggles, which heavily use `EditorBeatmap.PerformOnSelection()`.
The thing about that method is that it will attempt to check whether any
changes were actually made to avoid producing empty undo states, *but*
to do this, it must *serialise out the entire beatmap to a stream* and
then *binary equality check that* to determine whether any changes were
actually made:
7b14c77e43/osu.Game/Screens/Edit/EditorChangeHandler.cs (L65-L69)
As goes without saying, this is very expensive and unnecessary, which
leads to stuff like keeping a selection box active while a taiko beatmap
is playing under it dog slow. So to attempt to mitigate that, add
precondition checks to every single ternary callback of this sort to
avoid this serialisation overhead.
And yes, those precondition checks use linq, and that is *still* faster
than not having them.
I thought I had fixed this already once but it still looks broken.
Basically when hovering over main menu buttons every now and then it
will look like their backgrounds are not covering their entire width
when they expand.
The removed X position set looks wrong to me when inspecting the draw
visualiser with the element because the element looks to be off centre
horizontally, and removing it fixes that.
(Or local date, in the case of non-deployed builds).
Came up when I was looking at https://github.com/ppy/osu-web/pull/11240
and found that we were still hardcoding this.
Thankfully, this *should not* cause issues, since there don't seem to be
any (documented or undocumented) API response version checks for
versions newer than 20220705 in osu-web master.
For clarity and possible debugging needs, the API response version is
also logged.
