fix asserts when the root is hidden [backport of r45135 from trunk]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@52196 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/treectrl/treetest.cpp

@@ -327,6 +327,9 @@ void MyFrame::CreateTree(long style)
     m_treeCtrl = new MyTreeCtrl(m_panel, TreeTest_Ctrl,
                                 wxDefaultPosition, wxDefaultSize,
                                 style);
+
+    GetMenuBar()->Enable(TreeTest_SelectRoot, !(style & wxTR_HIDE_ROOT));
+
     Resize();
 }
 
@@ -519,6 +522,7 @@ void MyFrame::OnSelect(wxCommandEvent& WXUNUSED(event))
 
 void MyFrame::OnSelectRoot(wxCommandEvent& WXUNUSED(event))
 {
+    if ( !m_treeCtrl->HasFlag(wxTR_HIDE_ROOT) )
         m_treeCtrl->SelectItem(m_treeCtrl->GetRootItem());
 }
 
@@ -862,7 +866,7 @@ void MyTreeCtrl::AddTestItemsToTree(size_t numChildren,
     wxTreeItemId rootId = AddRoot(wxT("Root"),
                                   image, image,
                                   new MyTreeItemData(wxT("Root item")));
-    if ( image != -1 )
+    if ( !HasFlag(wxTR_HIDE_ROOT) && image != -1 )
     {
         SetItemImage(rootId, TreeCtrlIcon_FolderOpened, wxTreeItemIcon_Expanded);
     }
@@ -870,6 +874,7 @@ void MyTreeCtrl::AddTestItemsToTree(size_t numChildren,
     AddItemsRecursively(rootId, numChildren, depth, 0);
 
     // set some colours/fonts for testing
+    if ( !HasFlag(wxTR_HIDE_ROOT) )
         SetItemFont(rootId, *wxITALIC_FONT);
 
     wxTreeItemIdValue cookie;