Small wheel mouse patch

[Travis Michielsen]

This is a small patch that fixes handling of WM_MOUSEWHEEL messages in
non-client space.



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diff -u -r1.111 message.c
--- windows/message.c   2001/06/28 04:37:22     1.111
+++ windows/message.c   2001/06/28 18:11:24
@@ -503,8 +503,12 @@
         if (update) clk_msg = *msg;
     }

+    /* Treat the mouse wheel event separately because:
+     * 1) if the mouse is positioned in non-client space (eg on a scrollbar) wParam will be clobbered with hittest (wParam is used for key flags and zDelta)
+     * 2) windows has no concept of a non-client wheel message therefore we must not change the message
+     */
     pt = msg->pt;
-    if (hittest != HTCLIENT)
+    if (hittest != HTCLIENT && msg->message != WM_MOUSEWHEEL)
     {
         msg->message += WM_NCMOUSEMOVE - WM_MOUSEMOVE;
         msg->wParam = hittest;