Intent of intervalTree.ts ×3

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
    
    model/ 6 tests
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/intervalTree.test|title=IntervalTree 1 generated gen07|occurrence=1 Inherited intervalTree.test|title=IntervalTree 1 generated gen07|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/intervalTree.test|title=IntervalTree 1 generated gen15|occurrence=1 Inherited intervalTree.test|title=IntervalTree 1 generated gen15|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/editor/test/common/model/intervalTree.test|title=IntervalTree 1 generated gen17|occurrence=1 Inherited intervalTree.ts ×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/modelDecorations.test|title=deltaDecorations deltaDecorations 3|occurrence=1 Inherited modelDecorations.test|title=deltaDecorations deltaDecorations 3|occurrence=1