* Add failing test for copy->paste not being idempotent
* Ensure all elements on default skins use fixed anchors
`UsesFixedAnchor` defaults to false, i.e. closest anchors. Combined with
manual anchor / origin specs on some drawables, this would get default
skins into impossible states wherein a drawable would use "closest
anchor" but also explicitly specify anchor / origin that aren't closest,
which horribly fails on attempting to copy and paste.
Frankly shocked this has gone unnoticed for this long, and I regret not
vetoing this "feature" more every time I see its tentacles spread to
produce breakage of levels yet unseen.
Does this commit contain major levels of suck? For sure. Do I have any
better ideas that wouldn't consist of a multi-day rewrite or deletion of
this "feature"? No.
* Fix skin editor always applying closest anchor / origin on paste regardless of whether the component uses fixed anchor
Self-explanatory. Should close https://github.com/ppy/osu/issues/29111
along with previous commit.
They were broken because `SerialisedDrawableInfo` is a reference type
and as such equality checks will use reference equality rather than
member equality.
This is kind of how I see things working going forward, where the editor
can be applied to anything in the game which supports it (ie. a results
screen, gameplay screen, etc.) and it will immediately allow changing
the interface.
This adds a test scene which shows this working with gameplay.