[acdha]

That part is amazing: it calls into question the entire Android code review process that nobody thought breaking compatibility wasn’t a problem, much less doing so in a way which looks like one of the most familiar interfaces in the world. It seems unlikely that this isn’t just the first, most visible bug.

[ryanjshaw]

In case anybody is interested, it looks like they refactored the mode translation code to reuse another function, and the behaviour of that function was different from the original.

There were no unit tests written for the original implementation, but they did update the tests for the refactored function [1], and the tests clearly show different behaviour from the original implementation [2].

My best guess would be that the code wasn't reviewed.

[1] https://cs.android.com/android/_/android/platform/frameworks...

[2] https://cs.android.com/android/_/android/platform/frameworks...

[acdha]

Thanks for digging into that history!