refactor: use git reset --hard HEAD to discard all changes and use git restore --staged to unstage changes in text diff view

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

Author: love-linger

src/Commands/Discard.cs

@@ -36,7 +36,7 @@ public static void All(string repo, bool includeIgnored, Models.ICommandLog log)
                 });
             }
 
-            new Restore(repo) { Log = log }.Exec();
+            new Reset(repo, "HEAD", "--hard") { Log = log }.Exec();
             if (includeIgnored)
                 new Clean(repo) { Log = log }.Exec();
         }

src/Commands/Reset.cs

@@ -1,33 +1,7 @@
-using System.Collections.Generic;
-using System.Text;
-
-namespace SourceGit.Commands
+namespace SourceGit.Commands
 {
     public class Reset : Command
     {
-        public Reset(string repo)
-        {
-            WorkingDirectory = repo;
-            Context = repo;
-            Args = "reset";
-        }
-
-        public Reset(string repo, List<Models.Change> changes)
-        {
-            WorkingDirectory = repo;
-            Context = repo;
-
-            var builder = new StringBuilder();
-            builder.Append("reset --");
-            foreach (var c in changes)
-            {
-                builder.Append(" \"");
-                builder.Append(c.Path);
-                builder.Append("\"");
-            }
-            Args = builder.ToString();
-        }
-
         public Reset(string repo, string revision, string mode)
         {
             WorkingDirectory = repo;

src/Views/TextDiffView.axaml.cs

@@ -1928,8 +1928,10 @@ private void OnUnstageChunk(object _1, RoutedEventArgs _2)
             {
                 if (change.DataForAmend != null)
                     new Commands.UnstageChangesForAmend(repo.FullPath, [change]).Exec();
+                else if (change.Index == Models.ChangeState.Renamed)
+                    new Commands.Restore(repo.FullPath, [change.Path, change.OriginalPath], "--staged").Exec();
                 else
-                    new Commands.Reset(repo.FullPath, [change]).Exec();
+                    new Commands.Restore(repo.FullPath, [change.Path], "--staged").Exec();
             }
             else
             {