Apply Guichan's changes from 8090b4fbd0cb73c092307a5b551929275b8aef5a…

TODO

@@ -1,4 +1,4 @@
-* Continue rebasing from 8090b4fbd0cb73c092307a5b551929275b8aef5a
+* Continue rebasing from 9263b256a3f3fc7fd5388264d84fd623eb7a0097
 * Add a focus listener interface.
 * Make focus apply synchronously.
 * Graphics and input objects for DirectX.

src/widgets/listbox.cpp

@@ -169,6 +169,20 @@ namespace gcn
     void ListBox::logic()
     {
         adjustSize();
+
+        Rectangle scroll;
+
+        if (mSelected < 0)
+        {
+            scroll.y = 0;
+        }
+        else
+        {
+            scroll.y = getRowHeight() * mSelected;
+        }
+
+        scroll.height = getRowHeight();
+        showPart(scroll);
     }
 
     int ListBox::getSelected() const
@@ -196,20 +210,6 @@ namespace gcn
             {
                 mSelected = selected;
             }
-
-            Rectangle scroll;
-
-            if (mSelected < 0)
-            {
-                scroll.y = 0;
-            }
-            else
-            {
-                scroll.y = getRowHeight() * mSelected;
-            }
-
-            scroll.height = getRowHeight();
-            showPart(scroll);
         }
 
         distributeValueChangedEvent();

src/widgets/scrollarea.cpp

@@ -986,10 +986,15 @@ namespace gcn
 
     Rectangle ScrollArea::getChildrenArea()
     {
-        return Rectangle(0,
-                         0,
-                         getWidth() - (mVBarVisible ? mScrollbarWidth : 0),
-                         getHeight() - (mHBarVisible ? mScrollbarWidth : 0));
+        Rectangle area = Rectangle(0,
+                                   0,
+                                   getWidth() - (mVBarVisible ? mScrollbarWidth : 0),
+                                   getHeight() - (mHBarVisible ? mScrollbarWidth : 0));
+        if (area.width < 0 || area.height < 0)
+        {
+            return Rectangle();
+        }
+        return area;
     }
 
     Rectangle ScrollArea::getVerticalBarDimension()