comctl32: Added context menu to treeview.

dlls/comctl32/treeview.c

@@ -4160,6 +4160,21 @@ TREEVIEW_RButtonDown(TREEVIEW_INFO *infoPtr, LPARAM lParam)
 static LRESULT
 TREEVIEW_RButtonUp(const TREEVIEW_INFO *infoPtr, const POINT *pPt)
 {
+    TVHITTESTINFO ht;
+
+    ht.pt = *pPt;
+
+    TREEVIEW_HitTest(infoPtr, &ht);
+
+    if (ht.hItem)
+    {
+        /* Change to screen coordinate for WM_CONTEXTMENU */
+        ClientToScreen(infoPtr->hwnd, &ht.pt);
+
+        /* Send a WM_CONTEXTMENU message in response to the RBUTTONUP */
+        SendMessageW(infoPtr->hwnd, WM_CONTEXTMENU,
+            (WPARAM)infoPtr->hwnd, MAKELPARAM(ht.pt.x, ht.pt.y));
+    }
     return 0;
 }