@Override
    public void undo() {
        if (!getEditor().isReadOnly() && deleted != null && Character.isLetter(deleted)) {
            getEditor().move(getBeforeLine(), getBeforeColumn());
            getEditor().delete();
            getEditor().put(deleted.toString());
            getEditor().moveLeft(1);
        }
    }
@ Override public void undo ( ) { if ( ! getEditor ( ) . isReadOnly ( ) && deleted != null && Character . isLetter ( deleted ) ) { getEditor ( ) . move ( getBeforeLine ( ) , getBeforeColumn ( ) ) ; getEditor ( ) . delete ( ) ; getEditor ( ) . put ( deleted . toString ( ) ) ; getEditor ( ) . moveLeft ( 1 ) ; } }
Undo the {@link org.jledit.command.Command}.