ctkVTK*View freeze after call forceRender() on invisible widget

The flag RenderPending couldn't be reset if forceRender() was called with
RenderEnabled being false or the widget is invisible (scheduleRender()
 always exit because of the flag).

Libs/Visualization/VTK/Widgets/ctkVTKRenderView.cpp

@@ -267,6 +267,7 @@ void ctkVTKRenderView::forceRender()
 {
   Q_D(ctkVTKRenderView);
 
+  d->RenderPending = false;
   logger.trace(QString("forceRender - RenderEnabled: %1")
                .arg(d->RenderEnabled ? "true" : "false"));
 
@@ -275,7 +276,6 @@ void ctkVTKRenderView::forceRender()
     return;
     }
   d->RenderWindow->Render();
-  d->RenderPending = false;
 }
 
 //----------------------------------------------------------------------------

Libs/Visualization/VTK/Widgets/ctkVTKSliceView.cpp

@@ -137,13 +137,13 @@ void ctkVTKSliceView::scheduleRender()
 void ctkVTKSliceView::forceRender()
 {
   Q_D(ctkVTKSliceView);
+  d->RenderPending = false;
   if (!d->RenderEnabled  || !this->isVisible())
     {
     return;
     }
   logger.trace("forceRender");
   d->RenderWindow->Render();
-  d->RenderPending = false;
 }
 
 //----------------------------------------------------------------------------