merge window into layout

luigi/widget/sash.lua

@@ -27,7 +27,9 @@ function Sash:constructor(layout, data)
                     nextSibling[dimension] - event[axis])
         end
 
-        layout:update(true)
+        prevSibling:reflow()
+        nextSibling:reflow()
+        self:reflow()
     end)
 
 end

luigi/widget/slider.lua

@@ -16,7 +16,6 @@ function Slider:constructor(layout, data)
         position = (event.x - x1) / (x2 - x1)
         if position < 0 then position = 0 end
         if position > 1 then position = 1 end
-        self:update()
     end)
 
     self:onDisplay(function(event)