karellen / karellen-jdtls-kotlin / 25748247578

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Use DerivedSourceSearchParticipant and add resolveType fallback for non-Java types [release]

Rename searchParticipant to derivedSourceSearchParticipant throughout:
KotlinSearchParticipant now extends DerivedSourceSearchParticipant (with
getCompilationUnit() as a proper @Override), plugin.xml uses the renamed
extension point, and all test references updated from
SearchParticipantRegistry to DerivedSourceSearchParticipantRegistry.

Add KotlinTypeElement.resolveType() fallback via ImportResolver: when Java
delegation returns null (pure Kotlin declaring type with no Java
counterpart), resolve the type name through the file's import resolver by
trying all candidate FQNs against project.findType(). This enables
textDocument/typeDefinition for Kotlin elements whose declaring type cannot
resolve types through JDT's standard IType.resolveType() path.

Add KotlinCompilationUnit.getImportResolver() for use by resolveType
fallback — parses the file model and returns an ImportResolver for the
file's package and imports.

5 new tests in CrossLanguageHandlerTest: resolveType via default imports
(String), explicit imports (BigDecimal), method return type resolution,
field type resolution, and declaration fallback for type elements.

371 tests, all passing.

2506 of 3587 branches covered (69.86%)

Branch coverage included in aggregate %.

29 of 47 new or added lines in 2 files covered. (61.7%)

5260 of 6181 relevant lines covered (85.1%)

3.01 hits per line