don't skip the scroll position validity check in CalcScrollInc() if m_[xy]ScrollPixelsPerLine is NULL, this resulted in problems mentioned in patch 1696082

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45342 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/scrlwing.cpp

@@ -612,8 +612,6 @@ int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
     }
 
     if (orient == wxHORIZONTAL)
-    {
-        if (m_xScrollPixelsPerLine > 0)
     {
         if ( m_xScrollPosition + nScrollInc < 0 )
         {
@@ -630,12 +628,7 @@ int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
             }
         }
     }
-        else
-            m_targetWindow->Refresh(true, GetScrollRect());
-    }
-    else
-    {
-        if ( m_yScrollPixelsPerLine > 0 )
+    else // wxVERTICAL
     {
         if ( m_yScrollPosition + nScrollInc < 0 )
         {
@@ -652,12 +645,6 @@ int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
             }
         }
     }
-        else
-        {
-            // VZ: why do we do this? (FIXME)
-            m_targetWindow->Refresh(true, GetScrollRect());
-        }
-    }
 
     return nScrollInc;
 }