fix: use CoreEditor instead of RebaseEditor when rebase --continue (fix #2352)

- Use `CoreEditor` in rebase continue to prevent re-triggering the sequence
  editor on each `--continue` action
- Avoids git mis-counting done/todo entries and writing duplicate commit
  entries to the done file mid-rebase

(cherry picked from commit c14b2cedf850ab64d38cea44decf7abe871893fb)

Author: heartacker

src/ViewModels/InProgressContexts.cs

@@ -114,7 +114,11 @@ public RebaseInProgress(Repository repo)
             {
                 WorkingDirectory = repo.FullPath,
                 Context = repo.FullPath,
-                Editor = Commands.Command.EditorType.RebaseEditor,
+                // Use CoreEditor instead of RebaseEditor to avoid re-triggering
+                // the sequence.editor on each --continue. Re-triggering the todo
+                // editor mid-rebase can cause git to mis-count done/todo entries
+                // and write duplicate commit entries to the done file.
+                Editor = Commands.Command.EditorType.CoreEditor,
                 Args = "rebase --continue",
             };