Unify source tracking with SourceHandlingContext (#11632) - Replace boolean flags (hasMain, hasTest, etc.) with flexible set-based tracking for all language/scope combinations. - Rename ResourceHandlingContext to SourceHandlingContext - Add duplicate detection with WARNING for enabled sources - Add hasSources() method for checking language/scope combinations - Rename 'src' variable to 'sourceRoot' for clarity - Replace Collectors.toList() with .toList() in DefaultProjectBuilder - Use Java 17+ Stream.toList() instead of Collectors.toList(). - Fix Windows path separator issue in ProjectBuilderTest - Implement validation rules for modular source handling (#11612): - AC6: ERROR when mixing modular (with module) and classic (without module) sources within <sources> - AC7: WARNING when legacy <sourceDirectory>/<testSourceDirectory> are used in modular projects (both explicit config and filesystem existence) - Add validateNoMixedModularAndClassicSources() to SourceHandlingContext - Add warnIfExplicitLegacyDirectory() to DefaultProjectBuilder - Update tests to verify AC6 and AC7 behavior - Update test project comments to reflect correct behavior Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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