src/vs/workbench/browser/parts/editor/editorPart.ts/EditorPart/registerListeners
class EditorPart:	private registerListeners(): void {
		this._register(this.configurationService.onDidChangeConfiguration(e => this.onConfigurationUpdated(e)));
		this._register(this.themeService.onDidFileIconThemeChange(() => this.handleChangedPartOptions()));
	}