Intent of markerService.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/ 3 tests
- platform/ 3 tests
  - markers/ 3 tests
    
    test/ 3 tests
    
    common/ 3 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 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 MapMap#remove returns bad values, https://github.com/microsoft/vscode/issues/13548|occurrence=1 Inherited 13548|occurrence=1