Do not send LVN_DELETEITEM on LVM_DELETEALLITEMS for virtual listviews

[Igor Tarasov]

MSDN on LVM_DELETEALLITEMS for virtual listviews: "Sets the item count
to zero and clears all internal selection variables, but it does not
actually delete any items. It makes a notification callback.". There
should be single LVN_DELETEALLITEMS notification. But hundreds of
thousands notifications create an issue.
http://msdn.microsoft.com/en-us/library/bb774735(VS.85).aspx#Compatibility_issues

This patch is part of fix for bug #12701
http://bugs.winehq.org/show_bug.cgi?id=12701
-------------- next part --------------
diff --git a/dlls/comctl32/listview.c b/dlls/comctl32/listview.c
index af84938..6724139 100644
--- a/dlls/comctl32/listview.c
+++ b/dlls/comctl32/listview.c
@@ -4532,10 +4532,11 @@ static BOOL LISTVIEW_DeleteAllItems(LISTVIEW_INFO *infoPtr, BOOL destroy)
 
     for (i = infoPtr->nItemCount - 1; i >= 0; i--)
     {
-        /* send LVN_DELETEITEM notification, if not suppressed */
-	if (!bSuppress) notify_deleteitem(infoPtr, i);
 	if (!(infoPtr->dwStyle & LVS_OWNERDATA))
 	{
+            /* send LVN_DELETEITEM notification, if not suppressed
+               and if it is not a virtual listview */
+            if (!bSuppress) notify_deleteitem(infoPtr, i);
             hdpaSubItems = DPA_GetPtr(infoPtr->hdpaItems, i);
 	    for (j = 0; j < DPA_GetPtrCount(hdpaSubItems); j++)
 	    {