/** @param str If null, "" is used. */
public void appendText(String str) {
if (str == null) str = "";
clearSelection();
cursor = text.length();
paste(str, programmaticChangeEvents);
}
/** @param str If null, "" is used. */
public void setText(String str) {
if (str == null) str = "";
if (str.equals(text)) return;
clearSelection();
String oldText = text;
text = "";
paste(str, false);
if (programmaticChangeEvents) changeText(oldText, text);
cursor = 0;
}