skins2: small optimisation

Only update image and notify for those mouse events that we care about.
This removes the job being done twice (once on mouse pressed and once
 on mouse released)

modules/gui/skins2/controls/ctrl_tree.cpp

@@ -512,6 +512,9 @@ void CtrlTree::handleEvent( EvtGeneric &rEvent )
                 it->m_selected = (*it).m_selected || select;
                 select = nextSelect;
             }
+            // Redraw the control
+            makeImage();
+            notifyLayout();
         }
         else if( rEvent.getAsString().find( "mouse:left:down:ctrl" ) !=
                  string::npos )
@@ -523,6 +526,9 @@ void CtrlTree::handleEvent( EvtGeneric &rEvent )
                 it->m_selected = !it->m_selected;
                 m_pLastSelected = &*it;
             }
+            // Redraw the control
+            makeImage();
+            notifyLayout();
         }
         else if( rEvent.getAsString().find( "mouse:left:down:shift" ) !=
                  string::npos )
@@ -551,6 +557,9 @@ void CtrlTree::handleEvent( EvtGeneric &rEvent )
                 it->m_selected = select;
                 select = nextSelect;
             }
+            // Redraw the control
+            makeImage();
+            notifyLayout();
         }
         else if( rEvent.getAsString().find( "mouse:left:down" ) !=
                  string::npos )
@@ -585,8 +594,10 @@ void CtrlTree::handleEvent( EvtGeneric &rEvent )
                     }
                 }
             }
+            // Redraw the control
+            makeImage();
+            notifyLayout();
         }
-
         else if( rEvent.getAsString().find( "mouse:left:dblclick" ) !=
                  string::npos )
         {
@@ -596,10 +607,10 @@ void CtrlTree::handleEvent( EvtGeneric &rEvent )
                // Execute the action associated to this item
                m_rTree.action( &*it );
             }
+            // Redraw the control
+            makeImage();
+            notifyLayout();
         }
-        // Redraw the control
-        makeImage();
-        notifyLayout();
     }
 
     else if( rEvent.getAsString().find( "scroll" ) != string::npos )