Fixed delay in slideshow from toolbar button. This resolves bug 2306

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 2fb9f1c2a1)

digikam/digikam/digikamview.cpp

@@ -33,6 +33,7 @@
 #include <tqlabel.h>
 #include <tqimage.h>
 #include <tqevent.h>
+#include <tqeventloop.h>
 #include <tqapplication.h>
 #include <tqsplitter.h>
 #include <tqtimer.h>
@@ -1542,7 +1543,7 @@ void DigikamView::slideShow(ImageInfoList &infoList)
         settings.pictInfoMap.insert(info->kurl(), pictInfo);
 
         emit signalProgressValue((int)((i++/cnt)*100.0));
-        kapp->processEvents();
+        kapp->eventLoop()->processEvents(TQEventLoop::AllEvents & ~TQEventLoop::WaitForMore);
     }
 
     emit signalProgressBarMode(StatusProgressBar::TextMode, TQString());