[macOS] Modify behaviour when last editor gets closed

Don't call System.exit() but trust the ThinkDifferent handler
Handle reopen only if no editor is visible
Don't dispose last closing editor (so its toolbars are still in active state)

Author: facchinm

app/src/processing/app/Base.java

@@ -49,6 +49,7 @@
 import processing.app.debug.TargetPackage;
 import processing.app.debug.TargetPlatform;
 import processing.app.helpers.*;
+import processing.app.helpers.OSUtils;
 import processing.app.helpers.filefilters.OnlyDirs;
 import processing.app.helpers.filefilters.OnlyFilesWithExtension;
 import processing.app.javax.swing.filechooser.FileNameExtensionFilter;
@@ -931,15 +932,14 @@ public boolean handleClose(Editor editor) {
     }
 
     if (editors.size() == 1) {
-
+      editor.setVisible(false);
+      editors.remove(editor);
       handleQuit();
-
     } else {
       // More than one editor window open,
       // proceed with closing the current window.
       editor.setVisible(false);
       editor.dispose();
-
       editors.remove(editor);
     }
     return true;
@@ -974,7 +974,7 @@ public boolean handleQuit() {
       // Save out the current prefs state
       PreferencesData.save();
 
-      if (!OSUtils.hasMacOSStyleMenus()) {
+      if (!OSUtils.isMacOS()) {
         // If this was fired from the menu or an AppleEvent (the Finder),
         // then Mac OS X will send the terminate signal itself.
         System.exit(0);

app/src/processing/app/macosx/ThinkDifferent.java

@@ -23,6 +23,8 @@
 package processing.app.macosx;
 
 import com.apple.eawt.*;
+import com.apple.eawt.AppEvent.AppReOpenedEvent;
+
 import processing.app.Base;
 import processing.app.Editor;
 
@@ -45,6 +47,20 @@ public class ThinkDifferent {
 
   static public void init() {
     Application application = Application.getApplication();
+
+    application.addAppEventListener(new AppReOpenedListener() {
+      @Override
+        public void appReOpened(AppReOpenedEvent aroe) {
+          try {
+            if (Base.INSTANCE.getEditors().size() == 0) {
+              Base.INSTANCE.handleNew();
+            }
+          } catch (Exception e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+          }
+      }
+    });
     application.setAboutHandler(new AboutHandler() {
       @Override
       public void handleAbout(AppEvent.AboutEvent aboutEvent) {