src/vs/workbench/services/editor/browser/editorOverrideService.ts/EditorOverrideService/getEditorIds
class EditorOverrideService:	public getEditorIds(resource: URI): string[] {
		const editors = this.findMatchingEditors(resource);
		// This function is used to populate the reopen with.. context key and we do
		// not want to show the reopen with if there's an exclusive provider so we return no id's in that case
		if (editors.find(e => e.editorInfo.priority === RegisteredEditorPriority.exclusive)) {
			return [];
		}
		return editors.map(editor => editor.editorInfo.id);
	}