src/vs/workbench/services/editor/browser/editorService.ts/EditorService/getUniqueEditors
class EditorService:	private getUniqueEditors(editors: IEditorIdentifier[]): IEditorIdentifier[] {
		const uniqueEditors: IEditorIdentifier[] = [];
		for (const { editor, groupId } of editors) {
			if (uniqueEditors.some(uniqueEditor => uniqueEditor.editor.matches(editor))) {
				continue;
			}

			uniqueEditors.push({ editor, groupId });
		}

		return uniqueEditors;
	}