skins2: remove unnecessary notifyLayout()

In today's implementation, notifyLayout() for a control leads to a whole
 layout rebuilt. Therefore, this function must be called _only_ if needed.

- Never needed in onResize() since we are already in the process of rebuilding
the whole layout. Calling notifyLayout() means the job is done twice.
- Never needed in onPositionChange() for the same reason as onResize().
- Not needed for a checkbox since already called in setImage() two lines above.

modules/gui/skins2/controls/ctrl_checkbox.cpp

@@ -276,7 +276,5 @@ void CtrlCheckbox::changeButton()
 
     // Notify the window the tooltip has changed
     notifyTooltipChange();
-    // Refresh
-    notifyLayout();
 }
 

modules/gui/skins2/controls/ctrl_list.cpp

@@ -78,9 +78,8 @@ void CtrlList::onUpdate( Subject<VarPercent> &rPercent, void *arg  )
     // Get the size of the control
     const Position *pPos = getPosition();
     if( !pPos )
-    {
         return;
-    }
+
     int height = pPos->getHeight();
 
     // How many lines can be displayed ?
@@ -114,9 +113,8 @@ void CtrlList::onResize()
     // Get the size of the control
     const Position *pPos = getPosition();
     if( !pPos )
-    {
         return;
-    }
+
     int height = pPos->getHeight();
 
     // How many lines can be displayed ?
@@ -142,14 +140,12 @@ void CtrlList::onResize()
     }
 
     makeImage();
-    notifyLayout();
 }
 
 
 void CtrlList::onPositionChange()
 {
     makeImage();
-    notifyLayout();
 }
 
 

modules/gui/skins2/controls/ctrl_tree.cpp

@@ -244,13 +244,11 @@ void CtrlTree::onResize()
     // Redraw the control if the position has changed
     m_firstPos = it;
     makeImage();
-    notifyLayout();
 }
 
 void CtrlTree::onPositionChange()
 {
     makeImage();
-    notifyLayout();
 }
 
 void CtrlTree::handleEvent( EvtGeneric &rEvent )