Closes https://github.com/ppy/osu/issues/21794.
I'm not actually super sure as to what the exact mode of failure is
here, but it's 99% to do with working beatmap cache invalidation. Likely
this can be even considered as another case of
https://github.com/ppy/osu/issues/21357, but because this is a one-liner
"fix," I'm PRing it anyways.
The issue is confusing to understand when working with the swap scenario
given in the issue, but it's a little easier to understand when
performing the following:
1. Have a beatmap set with 2 difficulties. Let's call them "A" and "B".
2. From song select, without ever exiting to main menu, edit "A". Change
the difficulty name to "AA". Save and exit back to song select; do
not exit out to main menu.
3. From song select, edit "B". Change the difficulty name to "BB". Save
and exit back to song select.
4. The difficulty names will be "A" and "BB".
Basically what I *think* is causing this, is the fact that even though
editor invalidates the working beatmap by refetching it afresh on exit,
song select is blissfully unaware of this, and continues working with
its own `BeatmapInfo` instances which have backlinks to
`BeatmapSetInfo`.
When editing the first of the two difficulties and then the second,
the editing of the first one only invalidates the first one rather than
the entire set, and the second difficulty continues to have a stale
reference to the first one via the beatmap set, and as such ends up
overwriting the changes from the first save when passed into the editor
and modified again.
Closes https://github.com/ppy/osu/issues/22783.
If the difficulty being edited has unsaved changes, the editor exit flow
would prompt for save *after* the deletion method has run. This is
undesirable from a UX standpoint, and also leaves the user in a broken
state.
Thus, just fake an update of the last saved hash of the beatmap to fool
the editor into thinking that it's not dirty, so that the exit flow will
not show a save dialog.
Closes https://github.com/ppy/osu/issues/24274.
Bit of an ad-hoc resolution but maybe fine? This basically proposes to
bypass the problem described in the issue by just not showing tick hits
at all on the distribution graph.
Closes https://github.com/ppy/osu/issues/25633.
The reason why that particular beatmap did not have a double skip
on stable is here:
e53980dd76/osu!/GameModes/Play/Player.cs#L1761-L1770
The particular place of interest is the `leadInTime < 10000` check.
If `leadInTime < 10000`, then `leadIn == leadInTime`, and it turns out
that `AudioEngine.Time` will always be more than or equal to `leadIn`,
because it's also the gameplay start time:
e53980dd76/osu!/GameModes/Play/Player.cs#L2765
This essentially means that if the `leadInTime` is less than 10000,
that particular check is just dead. So a double skip can only occur
if the gameplay starts at time -10000 or earlier due to the storyboard.
