enhance: remember commit message when exiting (#1166)

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Models/RepositorySettings.cs

@@ -230,6 +230,12 @@ public int PreferredMergeMode
             set;
         } = 0;
 
+        public string LastCommitMessage
+        {
+            get;
+            set;
+        } = string.Empty;
+
         public Dictionary<string, FilterMode> CollectHistoriesFilters()
         {
             var map = new Dictionary<string, FilterMode>();

src/ViewModels/Repository.cs

@@ -464,13 +464,15 @@ public void Open()
             _selectedView = _histories;
             _selectedViewIndex = 0;
 
+            _workingCopy.CommitMessage = _settings.LastCommitMessage;
             _autoFetchTimer = new Timer(AutoFetchImpl, null, 5000, 5000);
             RefreshAll();
         }
 
         public void Close()
         {
             SelectedView = null; // Do NOT modify. Used to remove exists widgets for GC.Collect
+            _settings.LastCommitMessage = _workingCopy.CommitMessage;
 
             var settingsSerialized = JsonSerializer.Serialize(_settings, JsonCodeGen.Default.RepositorySettings);
             try