Intent of textModel.ts ×3

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/ 4 tests
  - test/ 4 tests
    
    common/ 4 tests
    
    model/ 3 tests
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/model.test|title=Editor Model - Model setValue eventing|occurrence=1 Inherited model.test|title=Editor Model - Model setValue eventing|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/textModel.test|title=TextModel.mightContainRTL setValue resets 1|occurrence=1 Inherited textModel.test|title=TextModel.mightContainRTL setValue resets 1|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/textModel.test|title=TextModel.mightContainRTL setValue resets 2|occurrence=1 Inherited textModel.test|title=TextModel.mightContainRTL setValue resets 2|occurrence=1
    
    services/ 1 test
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/services/modelService.test|title=ModelService setValue should clear undo stack|occurrence=1 Inherited undoRedoService.ts ×3