[FIX #283] enormous amounts of debug logs tremendously slowed down the GUI....

[FIX #283] enormous amounts of debug logs tremendously slowed down the GUI. Disabled debug logs in the GUI message dock completely.

src/qt4gui/WQt4Gui.cpp

@@ -299,8 +299,10 @@ void WQt4Gui::slotUpdateTextureSorter()
 
 void WQt4Gui::slotAddLog( const WLogEntry& entry )
 {
-    // emit event but the main window might not be available. Chick this.
-    if( m_mainWindow )
+    // emit event but the main window might not be available. Check this.
+    // NOTE: we disable debug log messages completely, since their extensive use in some modules causes SEVERE slowdown of the GUI as millions of
+    //       events need to be handled each GUI event loop. See issue #283 for details.
+    if( m_mainWindow && ( entry.getLogLevel() != LL_DEBUG ) )
     {
         QCoreApplication::postEvent( m_mainWindow, new WLogEvent( entry ) );
     }

src/qt4gui/WQtMessageDock.cpp

@@ -55,7 +55,7 @@ WQtMessageDock::WQtMessageDock( QString dockTitle, QWidget* parent ):
     // filter list
     m_filterCombo = new QComboBox();
     m_filterCombo->setToolTip( "Filter the messages by level. When choosing a level, all messages with this and an above level will be displayed." );
-    m_filterCombo->addItem( "Debug" );
+    // m_filterCombo->addItem( "Debug" ); // disabled. See issue #283
     m_filterCombo->addItem( "Info" );
     m_filterCombo->addItem( "Warning" );
     m_filterCombo->addItem( "Error" );
@@ -105,7 +105,7 @@ void WQtMessageDock::addMessage( QString title, QString message, WQtMessagePopup
     m_logList->setItemWidget( item, w );
 
     // hide messages not matching the filter
-    if( type < m_filterCombo->currentIndex() )
+    if( type < ( m_filterCombo->currentIndex() + 1 ) )
     {
         item->setHidden( true );
     }
@@ -141,7 +141,7 @@ void WQtMessageDock::handleFilterUpdate()
         WQtMessagePopup* popup = dynamic_cast< WQtMessagePopup* >( w );
         if( popup )
         {
-            li->setHidden( popup->getType() < m_filterCombo->currentIndex() );
+            li->setHidden( popup->getType() < ( m_filterCombo->currentIndex() + 1 ) );
         }
     }
 }