public void handleBackspace() {
		IndexRange selection = area.getSelection();
		if (selection.getLength() > 1) {
			area.deleteText(selection);
		} else {
			area.deletePreviousChar();
		}
	}
Pass along backspace handling when we observe {@link KeyCode#BACK_SPACE} in a {@link KeyEvent}.
recaf-ui/src/main/java/software/coley/recaf/ui/control/richtext/suggest/CompletionPopup.java