Fix drag/drop for automation patterns

There was some apparently legacy code that was entirely unnecessary and interfering with model drops.
Closes #814

src/core/AutomationPattern.cpp

@@ -35,6 +35,8 @@
 #include "ProjectJournal.h"
 #include "bb_track_container.h"
 #include "song.h"
+#include "text_float.h"
+#include "embed.h"
 
 
 const float AutomationPattern::DEFAULT_MIN_VALUE = 0;
@@ -96,8 +98,8 @@ void AutomationPattern::addObject( AutomatableModel * _obj, bool _search_dup )
 		{
 			if( *it == _obj )
 			{
-				// Already exists
-				// TODO: Maybe let the user know in some non-annoying way
+				textFloat::displayMessage( _obj->displayName(), tr( "Model is already connected "
+												"to this pattern." ), embed::getIconPixmap( "automation" ), 2000 );
 				return;
 			}
 		}

src/gui/AutomationPatternView.cpp

@@ -391,14 +391,6 @@ void AutomationPatternView::dropEvent( QDropEvent * _de )
 		{
 			engine::automationEditor()->setCurrentPattern( m_pat );
 		}
-
-		//This is the only model that's just added to AutomationPattern.
-		if( m_pat->m_objects.size() == 1 )
-		{
-			//scale the points to fit the new min. and max. value
-			this->scaleTimemapToFit( AutomationPattern::DEFAULT_MIN_VALUE,
-									 AutomationPattern::DEFAULT_MAX_VALUE );
-		}
 	}
 	else
 	{