Make jj abandon print each abandoned commit once

src/commands.rs

@@ -2038,8 +2038,8 @@ fn cmd_commit(ui: &mut Ui, command: &CommandHelper, args: &CommitArgs) -> Result
 fn resolve_multiple_rewriteable_revsets(
     revision_args: &[RevisionArg],
     workspace_command: &WorkspaceCommandHelper,
-) -> Result<Vec<Commit>, CommandError> {
-    let mut acc = Vec::new();
+) -> Result<IndexSet<Commit>, CommandError> {
+    let mut acc = IndexSet::new();
     for revset in revision_args {
         let revisions = workspace_command.resolve_revset(revset)?;
         workspace_command.check_non_empty(&revisions)?;
@@ -2058,9 +2058,7 @@ fn cmd_duplicate(
 ) -> Result<(), CommandError> {
     let mut workspace_command = command.workspace_helper(ui)?;
     let to_duplicate: IndexSet<Commit> =
-        resolve_multiple_rewriteable_revsets(&args.revisions, &workspace_command)?
-            .into_iter()
-            .collect();
+        resolve_multiple_rewriteable_revsets(&args.revisions, &workspace_command)?;
     let mut duplicated_old_to_new: IndexMap<Commit, Commit> = IndexMap::new();
 
     let mut tx = workspace_command

tests/test_abandon_command.rs

@@ -112,11 +112,8 @@ fn test_rebase_branch_with_merge() {
     // Test abandoning the same commit twice directly
     test_env.jj_cmd_success(&repo_path, &["undo"]);
     let stdout = test_env.jj_cmd_success(&repo_path, &["abandon", "b", "b"]);
-    // Note that the same commit is listed twice
     insta::assert_snapshot!(stdout, @r###"
-    Abandoned the following commits:
-      1394f625cbbd b
-      1394f625cbbd b
+    Abandoned commit 1394f625cbbd b
     "###);
     insta::assert_snapshot!(get_log_output(&test_env, &repo_path), @r###"
     @   e
@@ -131,12 +128,10 @@ fn test_rebase_branch_with_merge() {
     // Test abandoning the same commit twice indirectly
     test_env.jj_cmd_success(&repo_path, &["undo"]);
     let stdout = test_env.jj_cmd_success(&repo_path, &["abandon", "d:", "a:"]);
-    // Note that the same commit is listed twice
     insta::assert_snapshot!(stdout, @r###"
     Abandoned the following commits:
       5557ece3e631 e
       b7c62f28ed10 d
-      5557ece3e631 e
       1394f625cbbd b
       2443ea76b0b1 a
     Working copy now at: af874bffee6e (no description set)