Preserve node editor traffic type selection

[wnj00524]

No description provided.

[gemini-code-assist]

Code Review

This pull request modifies the RefreshTrafficTypeNameOptions method in MainWindowViewModel.cs to preserve the selected traffic type when the options collection is rebuilt. Feedback suggests handling potential case-sensitivity mismatches between the stored traffic type and the synchronized collection to ensure WPF correctly restores the selection.

[gemini-code-assist]

The selection restoration might fail if the casing of the traffic type in the TrafficTypeNameOptions collection differs from the selectedTrafficType captured from the profile. Since the collection is built using a case-insensitive Distinct(Comparer), it may contain a version of the string with different casing (e.g., "ABC" instead of "abc"). WPF's SelectedItem matching is case-sensitive, so it won't automatically restore the selection if the casing doesn't match exactly. Consider ensuring the profile's TrafficType is updated to match the casing found in the synchronized collection.

        // Re-announce the current selection after rebuilding the options collection so WPF restores the combo value.
        if (!string.IsNullOrWhiteSpace(selectedTrafficType))
        {
            var matchedType = TrafficTypeNameOptions.FirstOrDefault(name => Comparer.Equals(name, selectedTrafficType));
            if (matchedType != null && SelectedNodeTrafficProfile != null)
            {
                SelectedNodeTrafficProfile.TrafficType = matchedType;
            }

            OnPropertyChanged(nameof(SelectedNodeTrafficType));
        }