feature: auto-open commit message editor

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

src/Views/CommitMessageEditor.axaml.cs

@@ -17,23 +17,14 @@ namespace SourceGit.Views
         {
             _onSave = msg => File.WriteAllText(file, msg);
             _shouldExitApp = true;
-
-            var content = File.ReadAllText(file).ReplaceLineEndings("\n").Trim();
-            var parts = content.Split('\n', 2);
-            Editor.SubjectEditor.Text = parts[0];
-            if (parts.Length > 1)
-                Editor.DescriptionEditor.Text = parts[1];
+            Editor.Text = File.ReadAllText(file).ReplaceLineEndings("\n").Trim();
         }
 
         public void AsBuiltin(string msg, Action<string> onSave)
         {
             _onSave = onSave;
             _shouldExitApp = false;
-
-            var parts = msg.Split('\n', 2);
-            Editor.SubjectEditor.Text = parts[0];
-            if (parts.Length > 1)
-                Editor.DescriptionEditor.Text = parts[1];
+            Editor.Text = msg.Trim();
         }
 
         protected override void OnClosed(EventArgs e)

src/Views/InteractiveRebase.axaml

@@ -58,6 +58,7 @@
                                     ItemsSource="{Binding Items}"
                                     SelectionMode="Single"
                                     SelectedItem="{Binding SelectedItem, Mode=TwoWay}"
+                                    SelectionChanged="OnRowsSelectionChanged"
                                     ScrollViewer.HorizontalScrollBarVisibility="Disabled"
                                     ScrollViewer.VerticalScrollBarVisibility="Auto"
                                     Grid.IsSharedSizeScope="True">

src/Views/InteractiveRebase.axaml.cs

@@ -1,4 +1,5 @@
 using System;
+
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Controls.Shapes;
@@ -99,6 +100,23 @@ namespace SourceGit.Views
             Close();
         }
 
+        private void OnRowsSelectionChanged(object sender, SelectionChangedEventArgs e)
+        {
+            if (!_firstSelectionChangedHandled &&
+                sender is InteractiveRebaseListBox list &&
+                list.SelectedItem is ViewModels.InteractiveRebaseItem item)
+            {
+                _firstSelectionChangedHandled = true;
+
+                if (item.Action == Models.InteractiveRebaseAction.Reword)
+                {
+                    var dialog = new CommitMessageEditor();
+                    dialog.AsBuiltin(item.FullMessage, msg => item.FullMessage = msg);
+                    dialog.ShowDialog(this);
+                }
+            }
+        }
+
         private void OnSetupRowHeaderDragDrop(object sender, RoutedEventArgs e)
         {
             if (sender is Border border)
@@ -242,5 +260,7 @@ namespace SourceGit.Views
 
             flyout.Items.Add(menuItem);
         }
+
+        private bool _firstSelectionChangedHandled = false;
     }
 }