Update to Kotlin 2.0 and SDK 35

[stevenzeck]

Do not merge unless ready to accept Kotlin 2.0. Opening this to make sure the checks pass.

• Upgraded to Kotlin 2.0.x.
• Updated Android SDK to 35.
• KSP2 is not ready as it errors with Room. Leaving it commented out in gradle.properties. It won't be ready until Room is updated to 2.7.0 (currently in alpha), and a KSP2 issue with @TypeConverters.
• The Compose compiler now ships with Kotlin, instead of relying on keeping that synchronized.
• I used https://github.com/autonomousapps/dependency-analysis-gradle-plugin as a starting point to see which dependencies aren't needed in each module. I did remove all of the testImplementation and androidTestImplementation ones since they weren't being used. They can always be added back.
• Added a flag to the compiler options for Navigator and LCP modules: -Xconsistent-data-class-copy-visibility. See KT-11914.

[stevenzeck]

@mickael-menu This causes the app to crash with the below error when opening an epub. Declaring R2RTLViewPager as public fixes it. I don't know why, that old code just goes in a circle.

Possibly related to https://youtrack.jetbrains.com/issue/KT-63050/K1-K2-IllegalAccessError-when-accessing-a-private-field-isnt-detected-at-compile-time. Even though the OP there was using Kotlin 1.6.21 when reporting it.

java.lang.IllegalAccessError: Illegal class access: 'org.readium.r2.navigator.epub.EpubNavigatorFragment' attempting to access 'org.readium.r2.navigator.pager.R2RTLViewPager' (declaration of 'org.readium.r2.navigator.epub.EpubNavigatorFragment' appears in /data/app/~~-rjhsDrV6c9hFpC_VngmIw==/org.readium.r2reader-y1pHEqGxpJ6lP_pzngh9Iw==/base.apk!classes4.dex)
at org.readium.r2.navigator.epub.EpubNavigatorFragment.resetResourcePagerAdapter(EpubNavigatorFragment.kt:497)
at org.readium.r2.navigator.epub.EpubNavigatorFragment.resetResourcePager(EpubNavigatorFragment.kt:475)
at org.readium.r2.navigator.epub.EpubNavigatorFragment.onCreateView(EpubNavigatorFragment.kt:414)

[mickael-menu]

We could set it public with an @InternalReadiumApi annotation as a workaround. I wonder if this is related to the fact that R2RTLViewPager is a Java class. In which case we might have a similar problem when using the streaming ZIP container (e.g. when opening an EPUB from the shared storage).

[stevenzeck]

Fix will be in 2.0.20.

[stevenzeck]

@mickael-menu There is new behavior regarding non-public constructors of data classes and the copy() function, see KT-11914. I'm thinking we should annotate these with @ConsistentCopyVisibility; I don't think copy should be publicly visible in these cases.

Applicable to:

• Configuration
• MutableFontFamilyDeclaration
• MutableFontFaceDeclaration
• Valid
• Invalid
• TransitionTo

[mickael-menu]

@stevenzeck I agree, and that's a welcoming change!

Configuration has actually a public constructor, which delegates to the internal one. So copy should stay public there.

All the types under StateMachine are internal to the toolkit so I wouldn't bother annotating them as copy will never be part of the public API.

[stevenzeck]

I misread the phases. The @ConsistentCopyVisibility annotation (or -Xconsistent-data-class-copy-visibility flag) are only be necessary until Phase 3. I added the flag to the navigator and LCP gradle files.

[qnga]

What about Edge-to-edge content being the default with SDK 35 on Android 15? I think this should be tested on an actual Android 15 device as soon as we can.

[qnga]

We might need something like that on non-reading activities:

enableEdgeToEdge()
setContentView(R.layout.activity_main)
ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
    val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
    v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
    insets
}

That's what's AndroidStudio suggests now in new empty view projects.

[stevenzeck]

I tested it in the emulator, and yes padding was needed for the status bar. The BottomNavigationView handles that behavior change. enableEdgeToEdge() is only if the app should do edge-to-edge on older Android versions.

I did notice an issue in light mode when enableEdgeToEdge() is not in there in that the status bar text and icon colors don't contrast with the background. It's not specific to Readium though. Though it might be because there isn't much of a theme in there. I created a bug report.

[qnga]

In my understanding, if you don't call enableEdgeToEdge, you must apply padding only on Android 15. I didn't test it though.

[stevenzeck]

ViewCompat.setOnApplyWindowInsetsListener doesn't seem to be called in Android 14 and below if enableEdgeToEdge isn't in there. Up to you, but I think it's fine without it. I don't quite understand what they're doing with the status bar color when edge-to-edge is enabled. It doesn't use the dynamic colors.

[qnga]

ViewCompat.setOnApplyWindowInsetsListener doesn't seem to be called in Android 14 and below if enableEdgeToEdge isn't in there.

Sounds weird. That's something we've been using for a long time at different places. We'll see during tests.