Improve console behavior

* Pressing up and down again in the console will result in an empty line,
  not the stay at the last line from history
* Pressing up will really show the last command, not the last-but-one

neo/framework/Console.cpp

@@ -642,6 +642,11 @@ void idConsoleLocal::KeyDownEvent( int key )
 		{
 			consoleField.SetBuffer( hist );
 		}
+		else // DG: if no more lines are in the history, show a blank line again
+		{
+			consoleField.Clear();
+		} // DG end
+		
 		return;
 	}
 	
@@ -1413,4 +1418,4 @@ void idConsoleLocal::DrawDebugGraphs()
 	{
 		debugGraphs[i]->Render( renderSystem );
 	}
-}
+}

neo/framework/ConsoleHistory.cpp

@@ -131,6 +131,9 @@ idStr idConsoleHistory::RetrieveFromHistory( bool backward )
 	{
 		if( downPoint >= numHistory )
 		{
+			// DG: without this you'll get the last-but-one command when pressing UP
+			upPoint = downPoint - 1;
+			// DG end
 			return idStr( "" );
 		}
 		returnLine = downPoint;