void ReadDefaultLayout()
{
FileInfo fi = AbnakiFile.CombinedFilePath(Preference.ApplicationDefaultDir(),
Preference.ClassPrefsFileOnly <MainWindow>(layoutFileQualifier));
InvokeRestoringPanelLayout(fi);
}
/// <summary>
/// In a profile subdirectory
/// </summary>
/// <typeparam name="T">type of most-responsible consumer class</typeparam>
/// <param name="qualifier">can distinguish or clarify a special purpose file; be sure it's valid within filenames</param>
/// <returns></returns>
public static FileInfo ClassPrefsFile <T>(string qualifier = null)
{
string filename = ClassPrefsFileOnly <T>(qualifier);
return(AbnakiFile.CombinedFilePath(PrefsDir(), filename));
}