fix panic when cursor is OOB after closing editor with shorter msg

src/components/textinput.rs

@@ -89,7 +89,7 @@ impl TextInputComponent {
     /// Set the `msg`.
     pub fn set_text(&mut self, msg: String) {
         self.msg = msg;
-        //TODO: make sure cursor is in bounds
+        self.cursor_position = 0;
     }
 
     /// Set the `title`.