Intent of markerService.ts ×3

All 5 exact tests in this concept. Every test is marked by where it enters the hierarchy.

mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/ 5 tests
- platform/ 5 tests
  - markers/ 5 tests
    
    test/ 5 tests
    
    common/ 5 tests
    
    markerService.test|title=Marker Service changeOne/ 1 test
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/markers/test/common/markerService.test|title=Marker Service changeOne/All clears|occurrence=1 Inherited markerService.ts ×1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/markers/test/common/markerService.test|title=Marker Service changeAll merges|occurrence=1 Inherited markerService.test|title=Marker Service changeAll merges|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/markers/test/common/markerService.test|title=Marker Service changeAll must not break integrety, issue #12635|occurrence=1 Inherited markerService.test|title=Marker Service changeAll must not break integrety, issue #12635|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/markers/test/common/markerService.test|title=Marker Service changeAll sends event for cleared|occurrence=1 Inherited markerService.test|title=Marker Service changeAll sends event for cleared|occurrence=1
    
    mocha:v1|namespace=vscode@05c208e9e28d8c1c723fa08f85e2b7a96092e8e5|file=vs/platform/markers/test/common/markerService.test|title=Marker Service query|occurrence=1 Inherited markerService.test|title=Marker Service query|occurrence=1