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/gtk/fontdlg.cpp

@@ -88,6 +88,8 @@ bool wxFontDialog::DoCreate(wxWindow *parent)
 {
     m_needParent = false;
 
+    parent = GetParentForModalDialog(parent);
+
     if (!PreCreation( parent, wxDefaultPosition, wxDefaultSize ) ||
         !CreateBase( parent, -1, wxDefaultPosition, wxDefaultSize, wxDEFAULT_DIALOG_STYLE,
                      wxDefaultValidator, wxT("fontdialog") ))