src/vs/workbench/contrib/preferences/browser/keybindingsEditorContribution.ts/DefineKeybindingController/constructor
class DefineKeybindingController:	constructor(
		private _editor: ICodeEditor,
		@IInstantiationService private readonly _instantiationService: IInstantiationService,
		@IEnvironmentService private readonly _environmentService: IEnvironmentService
	) {
		super();

		this._register(this._editor.onDidChangeModel(e => this._update()));
		this._update();
	}