[gradle] Fix external dependency resolution when KSP is applied to Android modules

[kalin91]

Fix external dependency resolution when KSP is applied to Android modules

Fixes #225

Root cause

KSP registers its generated source directories on Android components as Providers backed by the producing KSP tasks. Querying such a provider before its task has run is illegal in Gradle.

The prepareKotlinIdeaImport task guards against this by declaring variant sources as task inputs (forcing the generator tasks to run before model building), but it only did so for main variants. Nested components (androidTest / unitTest) were not covered, so their KSP tasks (e.g. kspDebugAndroidTestKotlin) never ran. When ModuleSourceSetsModelBuilder later queried their sources, Gradle threw:

Querying the mapped value of provider(java.util.Set) before task ':app:kspDebugAndroidTestKotlin' has completed is not supported

The exception propagated out of resolveAndroidSourceSets, aborting the whole model builder. The module ended up with no source sets at all (IdeaProjectMapper - <module> has an empty set of source sets), and since library dependencies attach to source sets, every external .jar symbol became unresolvable in the editor — while the Gradle build itself kept working. Removing the KSP plugin removed the task-backed providers, which is why it "fixed" the problem.

Fix

Two layers:

1. prepareKotlinIdeaImport.kt — declare the sources of nested components as task inputs too, so their generator tasks run before model building (root cause).
2. resolveAndroidSourceSets.kt — resolve each component defensively: a component whose providers cannot be queried is skipped with a warning instead of discarding the source sets of the whole module (containment, so no future task-backed provider can empty a module again).

Verification

Reproduced with an Android app (AGP 9.2.1, Kotlin 2.3.21, KSP 2.3.9 with Hilt, Gradle 9.4.1) against extension 0.0.5 on Linux. With this patch compiled into workspace-import-gradle-plugin.jar:

• kspDebugUnitTestKotlin / kspDebugAndroidTestKotlin now run during import.
• The provider-query error is gone from the server log.
• <module>.app has an empty set of source sets is gone; the workspace model cache grew from 56 K to 65 K (source sets + dependencies now present).
• Semantic highlighting, hover, and Ctrl+Click navigation to external library symbols (decompiled stubs) work again.

Note for maintainers

I'm aware this repository is a read-only mirror and direct code contributions aren't integrated automatically — this PR is offered as a reference patch for the diagnosis in #225, to be integrated manually if useful.

Unrelated but observed while debugging on AGP 9.2.1: [IMPORT ERR]: Failed to call 'onVariants' in 'androidComponents' extension appears once during configuration (non-fatal; variants are still collected). May be worth a separate look.

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