They will not only contract if the user chooses to have them contract
(new setting in the `View` menu) or if the game isn't wide enough to
allow full interaction with the playfield while they are expanded.
Addressess https://github.com/ppy/osu/discussions/28970.
Until now, toolbox scroll areas would block input from arriving behind
them, even when no visible element was clicked.
In addition, clicking on a button inside a toolbox would still send a
`MouseDown` event to things behind it. Specifically, the editor's
`HitObjectComposer` would receive these events and also place objects
when the user does not expect them to be placed.
This fixes another regression that occurred due to `ScrollContainer`s no
longer blocking input theirselves.
Dean Herbert
Dan Balasescu