From 5bdeabafbec906ad680f82c67e3dfa0684592570 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sat, 24 Jul 2010 12:27:29 +0000
Subject: [PATCH] Postpone showing the notebook pages under wxOSX/Cocoa.

Showing the selected notebook page immediately when it's selected can result
in the top level parent of the notebook being shown prematurely, so don't do
this until the notebook itself is shown.

Closes #12227.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65078 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/osx/notebook_osx.cpp | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/src/osx/notebook_osx.cpp b/src/osx/notebook_osx.cpp
index dad2a6c5c4..95dfb988b4 100644
--- a/src/osx/notebook_osx.cpp
+++ b/src/osx/notebook_osx.cpp
@@ -378,6 +378,20 @@ void wxNotebook::OnSize(wxSizeEvent& event)
             pPage->Layout();
     }
 
+    // If the selected page is hidden at this point, the notebook
+    // has become visible for the first time after creation, and
+    // we postponed showing the page in ChangePage().
+    // So show the selected page now.
+    if ( m_nSelection != -1 )
+    {
+        wxNotebookPage *pPage = m_pages[m_nSelection];
+        if ( !pPage->IsShown() )
+        {
+            pPage->Show( true );
+            pPage->SetFocus();
+        }
+    }
+
     // Processing continues to next OnSize
     event.Skip();
 }
@@ -502,8 +516,20 @@ void wxNotebook::ChangePage(int nOldSel, int nSel)
     if ( nSel != -1 )
     {
         wxNotebookPage *pPage = m_pages[nSel];
-        pPage->Show( true );
-        pPage->SetFocus();
+        if ( IsShownOnScreen() )
+        {
+            pPage->Show( true );
+            pPage->SetFocus();
+        }
+        else
+        {
+            // Postpone Show() until the control is actually shown.
+            // Otherwise this forces the containing toplevel window
+            // to show, even if it's just being created and called
+            // AddPage() without intent to show the window yet.
+            // We Show() the selected page in our OnSize handler,
+            // unless it already is shown.
+        }
     }
 
     m_nSelection = nSel;