build: keep proto-generated files

[FineFindus]

What is it?

• Bugfix (user facing)
• Feature (user facing)
• Codebase improvement (dev facing)
• Meta improvement to the project (dev facing)

Description of the changes in your PR

Fixes, an issue, where the proto-generated files where removed by proguard, leading to an error.

Ref: TeamNewPipe/NewPipeExtractor#1104

APK testing

The APK can be found by going to the "Checks" tab below the title. On the left pane, click on "CI", scroll down to "artifacts" and click "app" to download the zip file which contains the debug APK of this PR. You can find more info and a video demonstration on this wiki page.

Due diligence

• I read the contribution guidelines.

[litetex]

Fixes, an issue, where the proto-generated files where removed by proguard, leading to an error.

Could you please explain what the error is because I can't find it...

[FineFindus]

Sure, the error is that Field browseId_ for org.schabi.newpipe.extractor.services.youtube.protos.playlist.PlaylistProtobufContinuation$ContinuationParams not found. Known fields are [public static final org.schabi.newpipe.extractor.services.youtube.protos.playlist.PlaylistProtobufContinuation$ContinuationParams org.schabi.newpipe.extractor.services.youtube.protos.playlist.PlaylistProtobufContinuation$ContinuationParams.DEFAULT_INSTANCE, public static volatile com.google.protobuf.GeneratedMessageLite$DefaultInstanceBasedParser org.schabi.newpipe.extractor.services.youtube.protos.playlist.PlaylistProtobufContinuation$ContinuationParams.PARSER].
It is printed right at startup. Presumably there will also be a crash when invoking the field. Please note that this should only appear in the release mode (with debugging turned off), as only then proguard is enabled.

[litetex]

@FineFindus

I currently have the latest nightly installed and I don't get such an error when the app starts (also not in the logs).

Could you provide more details?

[FineFindus]

Hmm, I can't replicate it either anymore. Maybe I messed something up when building.