Done for two reasons:
- During review it was requested for the logic to be moved out of
`BezierConverter` as `BezierConverter` was intended to produce
"lazer style" sliders with per-control-point curve types,
as a future usability / code layering concern.
- It is also relevant for encode-decode stability. With how the logic
was structured between the Bezier converter and the legacy beatmap
encoder, the encoder would leave behind per-control-point Bezier curve
specs that stable ignored, but subsequent encodes and decodes in lazer
would end up multiplying the doubled-up control points ad nauseam.
Instead, it is sufficient to only specify the curve type for the
head control point as Bezier, not specify any further curve types
later on, and instead just keep the double-up-control-point for new
implicit segment logic which is enough to make stable cooperate
(and also as close to outputting the slider exactly as stable would
have produced it as we've ever been)
The logic in `LegacyBeatmapEncoder` that was supposed to handle
the lazer-exclusive feature of supporting multiple slider segment types
in a single slider was interfering rather badly with the Bezier
converter. Generally it was a bit difficult to follow, too.
The nice thing about `BezierConverter` is that it is *guaranteed* to
only output Bezier control points. In light of this, the same double-up-
-the-control-point logic that was supposed to make multiple slider
segment types backwards-compatible with stable can be placed in
the Bezier conversion logic, and be *much* more understandable, too.
The `EventCount` variable wasn't factoring in that some results do not
affect unstable rate. It would therefore become more incorrect as the
play continued.
Closes https://github.com/ppy/osu/issues/31712.
The previous choices made it seem like potentially destructive actions
were being performed. I've gone with neutral colours and more suiting
icons to attempt to avoid this.
---
Addresses concerns in
https://github.com/ppy/osu/discussions/31621#discussioncomment-11948377.
I chose this design even though it wasn't the #1 most popular because I
personally feel that using green/red doesn't work great for these.