[G2pPack + Phonetic Assistant] Give same phonetic result for uppercase and lowercase graphemes

OpenUtau.Core/Api/G2pPack.cs

@@ -19,8 +19,8 @@
 
         protected Tuple<IG2p, InferenceSession> LoadPack(
             byte[] data,
             Func<string, string> prepGrapheme = null,
             Func<string, string> prepPhoneme = null) {
             prepGrapheme = prepGrapheme ?? ((string s) => s);
             prepPhoneme = prepPhoneme ?? ((string s) => s);
             string[] dictTxt = Zip.ExtractText(data, "dict.txt");
@@ -68,7 +68,7 @@
             if (grapheme.Length == 0 || kAllPunct.IsMatch(grapheme)) {
                 return null;
             }
-            var phonemes = Dict.Query(grapheme);
+            var phonemes = Dict.Query(grapheme.ToLowerInvariant());
             if (phonemes == null && !PredCache.TryGetValue(grapheme, out phonemes)) {
                 phonemes = Predict(grapheme);
                 if (phonemes.Length == 0) {

OpenUtau/ViewModels/PhoneticAssistantViewModel.cs

@@ -61,7 +61,7 @@ private void Refresh() {
                 Phonemes = string.Empty;
                 return;
             }
-            string[] phonemes = g2p.Query(Grapheme);
+            string[] phonemes = g2p.Query(Grapheme.ToLowerInvariant());
             if (phonemes == null) {
                 Phonemes = string.Empty;
                 return;