Intent of intervalTree.ts ×2

All 7 exact tests in this concept. Every test is marked by where it enters the hierarchy.

mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/ 7 tests
- editor/ 7 tests
  - test/ 7 tests
    
    common/ 7 tests
    
    model/ 7 tests
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/intervalTree.test|title=IntervalTree 1 generated gen03|occurrence=1 Inherited intervalTree.test|title=IntervalTree 1 generated gen03|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/intervalTree.test|title=IntervalTree 1 generated gen06|occurrence=1 Inherited intervalTree.test|title=IntervalTree 1 generated gen06|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/intervalTree.test|title=IntervalTree 1 generated gen11|occurrence=1 Inherited intervalTree.test|title=IntervalTree 1 generated gen11|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/intervalTree.test|title=IntervalTree 1 generated gen16|occurrence=1 Inherited intervalTree.test|title=IntervalTree 1 generated gen16|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/modelDecorations.test|title=deltaDecorations deltaDecorations 1|occurrence=1 Inherited intervalTree.ts ×3
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/modelDecorations.test|title=deltaDecorations deltaDecorations 2|occurrence=1 Inherited modelDecorations.test|title=deltaDecorations deltaDecorations 2|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