Resolves: fdo#84417 restore focus window after preview

regression due to changes of sd/source/ui/slideshow/slideshow.cxx
in cc5518ca

commit cc5518ca
Author: Steve Yin <steve_y@apache.org>
Date:   Thu Nov 28 12:09:19 2013 +0000
    Integrate branch of IAccessible2

Change-Id: I6b399d68c1f3ef32b702135b981100a23760569b

sd/source/ui/animations/SlideTransitionPane.cxx

@@ -847,6 +847,8 @@ void SlideTransitionPane::applyToSelectedPages()
 {
     if( ! mbUpdatingControls )
     {
+        Window *pFocusWindow = Application::GetFocusWindow();
+
         ::sd::slidesorter::SharedPageSelection pSelectedPages( getSelectedPages());
         impl::TransitionEffect aEffect = getTransitionEffectFromControls();
         if( ! pSelectedPages->empty())
@@ -863,6 +865,9 @@ void SlideTransitionPane::applyToSelectedPages()
             else
                 stopEffects();
         }
+
+        if (pFocusWindow)
+            pFocusWindow->GrabFocus();
     }
 }