Fixed|LogWidget|libappfw: Scroll position stays fixed when not at bottom

When new entries appear in the log, the scroll position should remain
stationary if the view is not at the bottom. Otherwise reading the
entries in the log is difficult.

doomsday/sdk/libappfw/src/widgets/logwidget.cpp

@@ -13,7 +13,7 @@
  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
  * General Public License for more details. You should have received a copy of
  * the GNU Lesser General Public License along with this program; if not, see:
- * http://www.gnu.org/licenses</small> 
+ * http://www.gnu.org/licenses</small>
  */
 
 #include "de/LogWidget"
@@ -399,7 +399,7 @@ public Font::RichFormat::IStyle
     }
 
     void updateStyle()
-    {        
+    {
         Style const &st = style();
 
         font           = &self.font();
@@ -531,6 +531,11 @@ public Font::RichFormat::IStyle
         // TODO: If content height changes below the visible range, we should adjust
         // the current scroll position so that the entries don't change position
         // inside the view.
+
+        if(!self.isAtBottom())
+        {
+            self.scrollPositionY().shift(delta);
+        }
     }
 
     void fetchNewCachedEntries()
@@ -734,7 +739,7 @@ public Font::RichFormat::IStyle
         // available for drawing.
         if(heightDelta)
         {
-            modifyContentHeight(heightDelta);            
+            modifyContentHeight(heightDelta);
             if(needHeightNotify && heightDelta > 0)
             {
                 emit self.contentHeightIncreased(heightDelta);