move aLastWheelEvent into svdata

just to keep them together and to drop the need for a static

Change-Id: I55c784f9fc075f4542542ee2ec649eff32d708ec

vcl/inc/svdata.hxx

@@ -31,6 +31,7 @@
 
 #include "vcleventlisteners.hxx"
 #include "impfontcache.hxx"
+#include "salwtype.hxx"
 #include "xconnection.hxx"
 
 #include <unordered_map>
@@ -194,6 +195,8 @@ struct ImplSVWinData
     ImageList*              mpMsgBoxImgList;                // ImageList for MessageBox
     VclPtr<vcl::Window>     mpAutoScrollWin;                // window, that is in AutoScrollMode mode
     VclPtr<vcl::Window>     mpLastWheelWindow;              // window, that last received a mouse wheel event
+    SalWheelMouseEvent      maLastWheelEvent;               // the last received mouse whell event
+
     StartTrackingFlags      mnTrackFlags;                   // tracking flags
     StartAutoScrollFlags    mnAutoScrollFlags;              // auto scroll flags
     bool                    mbNoDeactivate;                 // true: do not execute Deactivate

vcl/source/window/winproc.cxx

@@ -1474,8 +1474,6 @@ public:
 
 bool HandleWheelEvent::HandleEvent(const SalWheelMouseEvent& rEvt)
 {
-    static SalWheelMouseEvent aPreviousEvent;
-
     if (!Setup())
         return false;
 
@@ -1486,12 +1484,13 @@ bool HandleWheelEvent::HandleEvent(const SalWheelMouseEvent& rEvt)
     // avoid the problem that scrolling via wheel to this point brings a widget
     // under the mouse that also accepts wheel commands, so stick with the old
     // widget if the time gap is very small
-    if (shouldReusePreviousMouseWindow(aPreviousEvent, rEvt) && acceptableWheelScrollTarget(pSVData->maWinData.mpLastWheelWindow))
+    if (shouldReusePreviousMouseWindow(pSVData->maWinData.maLastWheelEvent, rEvt) &&
+        acceptableWheelScrollTarget(pSVData->maWinData.mpLastWheelWindow))
     {
         xMouseWindow = pSVData->maWinData.mpLastWheelWindow;
     }
 
-    aPreviousEvent = rEvt;
+    pSVData->maWinData.maLastWheelEvent = rEvt;
 
     pSVData->maWinData.mpLastWheelWindow = Dispatch(xMouseWindow);