[RAPPS] Forbid the "Install" tree-view section to collapse in APPWIZ …

…mode (reactos#6655)

However, there is currently a bug in Wine's comctl32, which ignores
the value returned from the TVN_ITEMEXPANDING notification handler
to control the collapse/expansion behaviour.

https://bugs.winehq.org/show_bug.cgi?id=53727

As a result, this feature doesn't work in ReactOS yet.

base/applications/rapps/gui.cpp

@@ -347,6 +347,22 @@ CMainWindow::ProcessWindowMessage(HWND hwnd, UINT Msg, WPARAM wParam, LPARAM lPa
 
             switch (data->code)
             {
+                case TVN_ITEMEXPANDING:
+                {
+                    if (data->hwndFrom == m_TreeView->m_hWnd)
+                    {
+                        // APPWIZ-mode: forbid item collapse.
+                        // FIXME: Prevent collapse (COMCTL32 is buggy)
+                        // https://bugs.winehq.org/show_bug.cgi?id=53727
+                        if (m_bAppwizMode && (((LPNMTREEVIEW)lParam)->action & TVE_TOGGLE) == TVE_COLLAPSE)
+                        {
+                            theResult = TRUE;
+                            return TRUE; // Handled
+                        }
+                    }
+                    break;
+                }
+
                 case TVN_SELCHANGED:
                 {
                     if (data->hwndFrom == m_TreeView->m_hWnd)