src/vs/workbench/services/preferences/browser/preferencesService.ts/PreferencesService/getActiveSettingsEditorInput
class PreferencesService:	private getActiveSettingsEditorInput(group: IEditorGroup = this.editorGroupService.activeGroup): PreferencesEditorInput {
		return <PreferencesEditorInput>group.editors.filter(e => e instanceof PreferencesEditorInput)[0];
	}