Add deadlock counter to prevent endless loop (issue #73)

--HG--
branch : misc-patches

code/nel/src/gui/widget_manager.cpp

@@ -1094,7 +1094,10 @@ namespace NLGUI
 							bool		updateCoordCalled= false;
 							// updateCoords the window only if the master group is his parent and if need it
 							// do it until updateCoords() no more invalidate coordinates!!
-							while (pIG->getParent()==rMG.Group && (pIG->getInvalidCoords()>0))
+
+							// add deadlock counter to prevent endless loop (Issue #73: web browser long scroll lockup)
+							int deadlock = 10;
+							while (--deadlock > 0 && pIG->getParent()==rMG.Group && (pIG->getInvalidCoords()>0))
 							{
 								bRecomputeCtrlUnderPtr = true;
 								// Update as many pass wanted (3 time for complex resizing, 1 for scroll for example)