Migrate off legacy Kotlin Gradle Plugin apply per the built-in-Kotlin migration (#636)#643
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…lutton#636) Flutter 3.44+ deprecates plugins that apply KGP themselves, and AGP 9 removes support for it (built-in Kotlin). Per the official plugin-author migration guide (https://docs.flutter.dev/release/breaking-changes/migrate-to-built-in-kotlin/for-plugin-authors), apply kotlin-android only when the consuming app's AGP major version is below 9, and replace the android.kotlinOptions block with the kotlin.compilerOptions DSL (requires KGP >= 2.0, already satisfied by kotlin_version 2.2.20). The conditional keeps the plugin buildable for apps on older stable Flutter/AGP versions.
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Addresses #636. Applies the official plugin-author migration (docs.flutter.dev → "Migrate to built-in Kotlin" → plugin authors), using the documented variant for plugins that support Flutter versions earlier than 3.44: KGP is applied conditionally only while AGP < 9, and
android.kotlinOptionsmoves to thekotlin { compilerOptions { jvmTarget = ... } }DSL. The buildscript Kotlin classpath is retained because the conditional branch can still apply KGP on older toolchains (kotlin_version 2.2.20 satisfies the compilerOptions DSL floor).Verification (build-verified locally before submitting):
flutter build apk --debugon the example is green on a current pre-release SDK (post-deprecation Gradle semantics, so the new DSL is exercised at configure time) and on Flutter 3.38.3 (older-consumer back-compat).Note: I couldn't capture the warning-disappears transition the 3.44 reporters see — the SDKs I have locally don't emit the KGP deprecation warning even on unmigrated master. This change follows the official migration doc for plugins supporting pre-3.44 Flutter, and the example builds green on both a current pre-release SDK and 3.38.3. Happy to adjust if CI on a newer stable shows anything different.