Intent of undoRedoService.ts ×1

All 4 exact tests in this concept. Every test is marked by where it enters the hierarchy.

mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/ 4 tests
- editor/ 1 test
  - test/ 1 test
    
    common/ 1 test
    
    services/ 1 test
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/services/modelService.test|title=ModelService does not maintain undo for same resource and different content|occurrence=1 Inherited modelService.ts ×1
- platform/ 3 tests
  - undoRedo/ 3 tests
    
    test/ 3 tests
    
    common/ 3 tests
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/undoRedo/test/common/undoRedoService.test|title=UndoRedoService multi resource elements|occurrence=1 Inherited undoRedoService.ts ×43
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/undoRedo/test/common/undoRedoService.test|title=UndoRedoService restoreSnapshot preserves elements that match the snapshot|occurrence=1 Inherited undoRedoService.ts ×3
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/undoRedo/test/common/undoRedoService.test|title=UndoRedoService simple single resource elements|occurrence=1 Inherited undoRedoService.ts ×9