Method showWarning

core/src/processing/core/PGraphics.java:8243–8251

Show a renderer error, and keep track of it so that it's only shown once. @param msg the error message (which will be stored for later comparison)

(String msg)

   * @param msg the error message (which will be stored for later comparison)
   */
  static public void showWarning(String msg) {  // ignore
    if (warnings == null) {
      warnings = new HashMap<>();
    }
    if (!warnings.containsKey(msg)) {
      System.err.println(msg);
      warnings.put(msg, new Object());
    }
  }


  /**