Don't try to show window when 'Minimize at startup' is enabled, prevents rendering glitches in Unity, resolves #304

src/main.cpp

@@ -97,13 +97,14 @@ int main(int argc, char** argv)
 
     MainWindow mainWindow;
     app.setMainWindow(&mainWindow);
-    mainWindow.show();
     
     QObject::connect(&app, SIGNAL(openFile(QString)), &mainWindow, SLOT(openDatabase(QString)));
     
     // start minimized if configured
     if (config()->get("GUI/MinimizeOnStartup").toBool()) {
         mainWindow.setWindowState(Qt::WindowMinimized);
+    } else {
+        mainWindow.show();
     }
     
     for (int ii=0; ii < args.length(); ii++) {