feedback fixes

Author: NathanBaulch

src/App.axaml.cs

@@ -462,7 +462,7 @@ private static bool TryLaunchAsRebaseTodoEditor(string[] args, out int exitCode)
                     Models.InteractiveRebaseAction.Reword => 'r',
                     Models.InteractiveRebaseAction.Squash => 's',
                     Models.InteractiveRebaseAction.Fixup => 'f',
-                    _ => 'p'
+                    _ => 'd'
                 };
                 writer.WriteLine($"{code} {job.SHA}");
             }

src/Commands/GenerateCommitMessage.cs

@@ -68,7 +68,7 @@ await _service.ChatAsync(
                     }
 
                     responseBuilder.AppendLine();
-                    summaryBuilder.AppendLine($"(file: {change.Path})");
+                    summaryBuilder.Append("(file: ").Append(change.Path).AppendLine(")");
                 }
 
                 if (_cancelToken.IsCancellationRequested)

src/Models/ExternalTool.cs

@@ -39,7 +39,7 @@ public void Open(string repo)
             {
                 WorkingDirectory = repo,
                 FileName = _execFile,
-                Arguments = _execArgsGenerator?.Invoke(repo) ?? string.Empty,
+                Arguments = _execArgsGenerator.Invoke(repo),
                 UseShellExecute = false,
             });
         }

src/ViewModels/Histories.cs

@@ -424,7 +424,7 @@ public ContextMenu CreateContextMenuForSelectedCommits(List<Models.Commit> selec
                 {
                     var builder = new StringBuilder();
                     foreach (var c in selected)
-                        builder.AppendLine($"{c.SHA.AsSpan(0, 10)} - {c.Subject}");
+                        builder.Append(c.SHA.AsSpan(0, 10)).Append(" - ").AppendLine(c.Subject);
 
                     await App.CopyTextAsync(builder.ToString());
                     e.Handled = true;

src/Views/Histories.axaml.cs

@@ -232,7 +232,7 @@ private async void OnCommitListKeyDown(object sender, KeyEventArgs e)
                     foreach (var item in selected)
                     {
                         if (item is Models.Commit commit)
-                            builder.AppendLine($"{commit.SHA.AsSpan(0, 10)} - {commit.Subject}");
+                            builder.Append(commit.SHA.AsSpan(0, 10)).Append(" - ").AppendLine(commit.Subject);
                     }
 
                     await App.CopyTextAsync(builder.ToString());