Fix optimization to not fetch all possible endpoints for non-connectable.

eeschema/sch_line.cpp

@@ -589,6 +589,8 @@ void SCH_LINE::GetEndPoints( std::vector <DANGLING_END_ITEM>& aItemList )
 
 bool SCH_LINE::UpdateDanglingState( std::vector<DANGLING_END_ITEM>& aItemList,
                                     const SCH_SHEET_PATH* aPath )
+{
+    if( IsConnectable() )
     {
         bool previousStartState = m_startIsDangling;
         bool previousEndState = m_endIsDangling;
@@ -618,10 +620,13 @@ bool SCH_LINE::UpdateDanglingState( std::vector<DANGLING_END_ITEM>& aItemList,
         // has changed or not (and returning true will result in extra work)
         if( IsBus() )
             return false;
-    else
+
         return previousStartState != m_startIsDangling || previousEndState != m_endIsDangling;
     }
 
+    return false;
+}
+
 
 bool SCH_LINE::IsConnectable() const
 {

eeschema/sch_screen.cpp

@@ -981,6 +981,8 @@ void SCH_SCREEN::TestDanglingEnds( const SCH_SHEET_PATH* aPath,
     std::vector<DANGLING_END_ITEM> endPoints;
 
     for( SCH_ITEM* item : Items() )
+    {
+        if( item->IsConnectable() )
         {
             endPoints.clear();
 
@@ -994,6 +996,7 @@ void SCH_SCREEN::TestDanglingEnds( const SCH_SHEET_PATH* aPath,
             }
         }
     }
+}
 
 
 SCH_LINE* SCH_SCREEN::GetLine( const wxPoint& aPosition, int aAccuracy, int aLayer,