Intent of stringBuilder.ts ×1

All 6 exact tests in this concept. Every test is marked by where it enters the hierarchy.

mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/ 6 tests
- editor/ 6 tests
  - test/ 6 tests
    
    common/ 6 tests
    
    core/ 2 tests
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/core/stringBuilder.test|title=decodeUTF16LE issue #118041: unicode character undo bug 2|occurrence=1 Introduced here
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/core/stringBuilder.test|title=decodeUTF16LE issue #118041: unicode character undo bug 3|occurrence=1 Introduced here
    
    model/ 3 tests
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/editStack.test|title=EditStack issue #118041: unicode character undo bug|occurrence=1 Inherited editStack.test|title=EditStack issue #118041: unicode character undo bug|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/modelInjectedText.test|title=Editor Model - Injected Text Events Basic|occurrence=1 Inherited textModel.ts ×6
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/textChange.test|title=TextChange issue #118041: unicode character undo bug|occurrence=1 Inherited textChange.test|title=TextChange issue #118041: unicode character undo bug|occurrence=1
    
    services/ 1 test
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/services/modelService.test|title=ModelService maintains undo for same resource and same content|occurrence=1 Inherited undoRedoService.ts ×2