Fix multiplayer song select not correctly applying filter sometimes #30425
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Fixes the root client-side failure causing ppy#30415. Thread of breakage is as follows: 1. `SongSelect` loads the carousel. At this point, the ruleset is what the ambient ruleset would have been at the time of pushing song select, so most likely it will match the current ruleset. Notably, the carousel is loaded with `AllowSelection == false`. 2. `OnlinePlaySongSelect` sets the ruleset to the one taken from the relevant playlist item in `LoadComplete()`. 3. At any point between the previous and the next step, the user changes the ruleset manually. 4. `SongSelect.carouselBeatmapsLoaded()` is ran, which calls `transferRulesetValue()`, which calls `FilterControl.FilterChanged`. But at this stage `Carousel.AllowSelection` is still false, so the filter is not executed, but `pendingFilterApplication` is set instead. Unfortunately, the pending filter never gets applied after that. The only place that checks that flag is `OnEntering()`, which at this point has already ran. To fix, move the `pendingFilterApplication` check to `Update()`, which seems like the most obvious and safe solution.
bdach
added
area:song-select
area:multiplayer
next release
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FWIW, I wouldn't be surprised if this happens to fix #29751 too. |
Doesn't seem to fix that issue. |
peppy
approved these changes
Nov 11, 2024
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RFC. Fixes the root client-side failure causing #30415.
Thread of breakage is as follows:
SongSelectloads the carousel. At this point, the ruleset is what the ambient ruleset would have been at the time of pushing song select, so most likely it will match the current ruleset. Notably, the carousel is loaded withAllowSelection == false.OnlinePlaySongSelectsets the ruleset to the one taken from the relevant playlist item inLoadComplete().SongSelect.carouselBeatmapsLoaded()is ran, which callstransferRulesetValue(), which callsFilterControl.FilterChanged. But at this stageCarousel.AllowSelectionis still false, so the filter is not executed, butpendingFilterApplicationis set instead. Unfortunately, the pending filter never gets applied after that. The only place that checks that flag isOnEntering(), which at this point has already ran.To fix, move the
pendingFilterApplicationcheck toUpdate(), which seems like the most obvious and safe solution.