src/vs/base/parts/quickinput/browser/quickInput.ts/QuickInputController/focus
class QuickInputController:	focus() {
		if (this.isDisplayed()) {
			const ui = this.getUI();
			if (ui.inputBox.enabled) {
				ui.inputBox.setFocus();
			} else {
				ui.list.domFocus();
			}
		}
	}