Move to ANTLR 4 with Java 11 language features and localization of more syntax errors.

app/src/processing/app/Platform.java

@@ -75,6 +75,10 @@ public class Platform {
 
   // . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
 
+  static public boolean isInit() {
+    return inst != null;
+  }
+
 
   static public void init() {
     try {

app/src/processing/app/tools/InstallCommander.java

@@ -161,4 +161,4 @@ public boolean accept(File dir, String name) {
       list.append(jar.getAbsolutePath());
     }
   }
-}
+}

app/src/processing/app/ui/Editor.java

@@ -2898,7 +2898,6 @@ public void statusError(String what) {
    * Show an exception in the editor status bar.
    */
   public void statusError(Exception e) {
-    e.printStackTrace();
 //    if (e == null) {
 //      System.err.println("Editor.statusError() was passed a null exception.");
 //      return;
@@ -2909,9 +2908,7 @@ public void statusError(Exception e) {
 
       // Make sure something is printed into the console
       // Status bar is volatile
-      if (!re.isStackTraceEnabled()) {
-        System.err.println(re.getMessage());
-      }
+      System.err.println(re.getMessage());
 
       // Move the cursor to the line before updating the status bar, otherwise
       // status message might get hidden by a potential message caused by moving
@@ -2940,6 +2937,8 @@ public void statusError(Exception e) {
                           textarea.getLineStopOffset(line) - 1);
         }
       }
+    } else {
+      e.printStackTrace();
     }
 
     // Since this will catch all Exception types, spend some time figuring