fix aui crash related to SF bug 1531361

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42806 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/aui/framemanager.cpp

@@ -2067,6 +2067,22 @@ void wxFrameManager::Update()
             // reduce flicker
             p.window->SetSize(1,1);
 
+
+	    // the following block is a workaround for bug #1531361
+	    // (see wxWidgets sourceforge page).  On wxGTK (only), when
+	    // a frame is shown/hidden, a move event unfortunately
+	    // also gets fired.  Because we may be dragging around
+	    // a pane, we need to cancel that action here to prevent
+	    // a spurious crash.
+	    if (m_action_window == p.frame)
+	    {
+		if (wxWindow::GetCapture() == m_frame)
+                    m_frame->ReleaseMouse();
+                m_action = actionNone;
+		m_action_window = NULL;
+	    }
+
+	    // hide the frame
             if (p.frame->IsShown())
                 p.frame->Show(false);