refactor!: improved interface of cancellable tile loading #1941
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This is probably how I should've implemented it in the first place back in #1622 - it's a much better interface and wouldn't have been breaking. However, it's too late now, so I've opened this as draft.
dart-lang/http#978 has been re-opened. I'm hopeful it will get merged at some point. If it does, we will want to more strongly enforce the cancellable mechanisms, and maybe that will be a good time to switch to an implementation like this.