only execute app-startup behaviour if we are not a plug-in

src/osx/cocoa/utils.mm

@@ -427,6 +427,8 @@ bool wxApp::CallOnInit()
     m_onInitResult = false;
     m_inited = false;
 
+    if ( !sm_isEmbedded )
+    {
         // Feed the upcoming event loop with a dummy event. Without this,
         // [NSApp run] below wouldn't return, as we expect it to, if the
         // application was launched without being activated and would block
@@ -440,10 +442,11 @@ bool wxApp::CallOnInit()
                                      subtype:0 data1:0 data2:0];
         [NSApp postEvent:event atStart:FALSE];
         [NSApp run];
+    }
 
     m_onInitResult = OnInit();
     m_inited = true;
-    if ( m_onInitResult )
+    if ( !sm_isEmbedded && m_onInitResult )
     {
         if ( m_openFiles.GetCount() > 0 )
             MacOpenFiles(m_openFiles);