Fix view activation of dropped view

Get rid of the showView() internal call. That is wrong. Let the view
manager handle showing/activation

apps/lib/kateviewmanager.cpp

@@ -1043,6 +1043,7 @@ void KateViewManager::moveViewToViewSpace(KateViewSpace *dest, KateViewSpace *sr
 
     dest->addView(view);
     setActiveSpace(dest);
+    activateView(view);
 }
 
 void KateViewManager::splitViewSpace(KateViewSpace *vs, // = 0

apps/lib/kateviewspace.cpp

@@ -660,7 +660,6 @@ void KateViewSpace::addView(KTextEditor::View *v)
     // We must not already have this widget
     Q_ASSERT(stack->indexOf(v) == -1);
     stack->addWidget(v);
-    showView(v);
 }
 
 void KateViewSpace::documentDestroyed(QObject *doc)