added wxDialog::GetParentForModalDialog() and use it to try to always create modal dialogs with a parent (slightly modified patch 1702962)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45588 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/filedlgg.cpp

@@ -996,6 +996,8 @@ bool wxGenericFileDialog::Create( wxWindow *parent,
 {
     m_bypassGenericImpl = bypassGenericImpl;
 
+    parent = GetParentForModalDialog(parent);
+
     if (!wxFileDialogBase::Create(parent, message, defaultDir, defaultFile,
                                   wildCard, style, pos, sz, name))
     {