src/vs/editor/browser/controller/textAreaInput.ts/TextAreaInput/focusTextArea
class TextAreaInput:	public focusTextArea(): void {
		// Setting this._hasFocus and writing the screen reader content
		// will result in a focus() and setSelectionRange() in the textarea
		this._setHasFocus(true);

		// If the editor is off DOM, focus cannot be really set, so let's double check that we have managed to set the focus
		this.refreshFocusState();
	}