Update viewer.

* viewer/image_region.cc,
* viewer/image_region.hxx:
Fix graphic bug when moving the view while an object is selected.

viewer/image_region.cc

@@ -104,6 +104,7 @@ ImageRegion::select()
   {
     selected_ = true;
     setZValue(2);
+    prepareGeometryChange();
     scene()->invalidate();
     update();
   }
@@ -115,8 +116,9 @@ ImageRegion::deselect()
   if (selected_)
   {
     selected_ = false;
-    scene()->invalidate();
     setZValue(1);
+    prepareGeometryChange();
+    scene()->invalidate();
     update();
   }
 }

viewer/image_region.hxx

@@ -70,6 +70,8 @@ inline
 QRectF
 ImageRegion::boundingRect() const
 {
+  if (selected_)
+    return mapFromScene(scene()->sceneRect()).boundingRect();
   return rect_;
 }