* ctrl_*.cpp : mouse scrolling behavior change

 * skin_parser.cpp : add comment so people know where to look to fix the
                     Playlist slider breakage.

modules/gui/skins2/controls/ctrl_list.cpp

@@ -332,13 +332,14 @@ void CtrlList::handleEvent( EvtGeneric &rEvent )
         int direction = ((EvtScroll&)rEvent).getDirection();
 
         double percentage = m_rList.getPositionVar().get();
+        double step = 2.0 / (double)m_rList.size();
         if( direction == EvtScroll::kUp )
         {
-            percentage += SCROLL_STEP;
+            percentage += step;
         }
         else
         {
-            percentage -= SCROLL_STEP;
+            percentage -= step;
         }
         m_rList.getPositionVar().set( percentage );
     }

modules/gui/skins2/controls/ctrl_tree.cpp

@@ -345,13 +345,14 @@ void CtrlTree::handleEvent( EvtGeneric &rEvent )
         int direction = ((EvtScroll&)rEvent).getDirection();
 
         double percentage = m_rTree.getPositionVar().get();
+        double step = 2.0 / (double)m_rTree.visibleItems();
         if( direction == EvtScroll::kUp )
         {
-            percentage += SCROLL_STEP;
+            percentage += step;
         }
         else
         {
-            percentage -= SCROLL_STEP;
+            percentage -= step;
         }
         m_rTree.getPositionVar().set( percentage );
     }

modules/gui/skins2/parser/skin_parser.cpp

@@ -331,7 +331,7 @@ void SkinParser::handleBeginElement( const string &rName, AttrList_t &attr )
         {
             // Slider associated to a list
             newValue = "playlist.slider";
-            // FIXME
+            // FIXME : this breaks slider usage in old style Playlists
             newValue = "playtree.slider";
         }
         const BuilderData::Slider slider( uniqueId( attr["id"] ),