From 78d0393cc068103fd6bf13e5f52b74f939fef1c5 Mon Sep 17 00:00:00 2001
From: Paul Cornett <paulcor@bullseye.com>
Date: Wed, 11 Feb 2015 18:05:15 +0000
Subject: [PATCH] avoid GDK assertion "impl_window->update_freeze_count > 0" on
 Ubuntu when enabling frozen window closes #16795

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78474 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/gtk/window.cpp | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index 8235a38288..a5c4d171cf 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -3319,13 +3319,52 @@ bool wxWindowGTK::Show( bool show )
     return true;
 }
 
+static bool GetFrozen(wxWindowGTK* win, wxVector<wxWindowGTK*>& vector)
+{
+    bool scroll =
+        GTK_IS_SCROLLED_WINDOW(win->m_widget) || GTK_IS_SCROLLBAR(win->m_widget);
+
+    if (win->IsFrozen())
+        vector.push_back(win);
+
+    wxWindowList& children = win->GetChildren();
+    for (wxWindowList::iterator i = children.begin(); i != children.end(); ++i)
+    {
+        if (GetFrozen(*i, vector))
+            scroll = true;
+    }
+
+    return scroll;
+}
+
 void wxWindowGTK::DoEnable( bool enable )
 {
     wxCHECK_RET( (m_widget != NULL), wxT("invalid window") );
 
+    wxVector<wxWindowGTK*> frozen;
+    if (enable)
+    {
+        // Ubuntu overlay scrollbar can cause GdkWindow.impl_window to change
+        // (by indirectly invoking gdk_window_ensure_native()), which messes up
+        // the freeze count. Avoid this by temporarily un-freezing window hierarchy.
+        if (GetFrozen(this, frozen))
+        {
+            for (unsigned i = frozen.size(); i--;)
+                frozen[i]->DoThaw();
+        }
+        else
+            frozen.clear();
+    }
+
     gtk_widget_set_sensitive( m_widget, enable );
     if (m_wxwindow && (m_wxwindow != m_widget))
         gtk_widget_set_sensitive( m_wxwindow, enable );
+
+    if (enable)
+    {
+        for (unsigned i = frozen.size(); i--;)
+            frozen[i]->DoFreeze();
+    }
 }
 
 int wxWindowGTK::GetCharHeight() const