Skip EVT_RIGHT_UP event in wxHtmlWindow if it wasn't handled.

This fixes generation of EVT_CONTEXT_MENU for mouse clicks in wxHtmlWindow
under MSW: it wasn't generated before because we always ate the right mouse
clicks.

Closes #2465.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70394 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/htmlwin.cpp

@@ -1282,7 +1282,8 @@ void wxHtmlWindow::OnMouseUp(wxMouseEvent& event)
 #endif // wxUSE_CLIPBOARD
 
     wxPoint pos = CalcUnscrolledPosition(event.GetPosition());
-    wxHtmlWindowMouseHelper::HandleMouseClick(m_Cell, pos, event);
+    if ( !wxHtmlWindowMouseHelper::HandleMouseClick(m_Cell, pos, event) )
+        event.Skip();
 }
 
 #if wxUSE_CLIPBOARD