`TestSceneEditorTestGameplay` is not isolated from database, and one of
the tests exiting editor when seeked to 60000 milliseconds
(`TestClockTimeTransferIsOneDirectional()`) ended up changing
`EditorTimestamp` to the same value, causing
`TestSaveChangesBeforeGameplayTest()` to fail due to changing initial
state.
To fix, perform a direct deletion of imported beatmaps in realm to avert
this scenario, contrary to the soft-deletion via `BeatmapManager` done
previously.
`dimensions` would always receive exactly one item, so might as well
inline it.
And yes, at this point the grid container is mostly a glorified
`FillFlowContainer { Direction = FlowDirection.Vertical }`, but I am not
touching that in this pull pending further decisions with respect to
direction.
There were no usages of more than one column being provided per row, so
it seemed like unnecessarily complexity. I'm currently trying to reduce
complexity so we can improve the layout of the results screen, which
currently has up to three levels of nested `GridContainer`s.
Of note, I can't add backwards compatibility because the method
signature has not changed in `Ruleset` (only the return type). If we do
want to keep compatibility with other rulesets, we could designate a new
name for the updated method.