ALT-10998 [IDE Plugin] Code files are not transferred to the next stage

[Tsyklop]

This update addresses issues where code files (both user-created and template additions) were not correctly transferred between stages in Framework Lessons. It also improves the reliability of the auto-save mechanism and ensures that generated or excluded files do not pollute the task snapshots.

Key Improvements

• Fixed Stage-to-Stage File Propagation:
  • Corrected the "first-visit" logic to ensure that files created by the learner in previous stages are properly propagated and registered in the next stage's task files.
  • Ensured that new template files introduced in later stages are correctly added to the project state without being overwritten or ignored.
• Enhanced Snapshot Accuracy:
  • Persistence of Deletions: Fixed a bug where deleting all editable files would cause the auto-save to bail out, resulting in "resurrection" of deleted files upon returning to the stage. Deletions are now correctly persisted to the snapshot.
  • Configurable Exclusions: Integrated the course configurator's exclusion rules (e.g., ignoring .build/ or .gradle/ folders) into the snapshot process to prevent internal or generated files from being tracked.
• Added Regression Tests:
  • Introduced FrameworkLessonUserFilesPropagationTest.kt to verify:
    • Learner-created files are correctly marked as isLearnerCreated and carried forward.
    • Excluded files/directories are omitted from the storage snapshot.
    • Auto-save correctly handles the state where all propagatable files are removed.

Technical Details

• FrameworkLessonManagerImpl.kt:
  • Updated calculateFirstVisitChanges to separate propagation of user-created files from the addition of new template files.
  • Refactored saveCurrentTaskSnapshot to use getAllFilesFromTaskDir and apply configurator-based filtering.
  • Modified the change detection logic to ensure snapshots are updated even when the resulting set of propagatable files is empty.