fix: remove outdated patch_supports gate and fix fetch parent fallback

Remove the patch_supports_commit_ids gates in checkout.rs and list.rs
that pre-dated the mbox fallback logic. apply_patch_chain already
handles all fallback cases. Also replace the main-branch TODO fallback
in make_commits_for_proposal with get_parent_commit_from_patch, which
uses timestamp-based best-guess when the parent-commit tag is absent.

1 files changed, 4 insertions, 5 deletions

diff --git a/src/lib/git_events.rs b/src/lib/git_events.rs
index b39e797..32c23ac 100644
--- a/src/lib/git_events.rs
+++ b/src/lib/git_events.rs
@@ -40,17 +40,16 @@ pub fn get_commit_id_from_patch(event: &Event) -> Result<String> {
     }
 }
 
-pub fn get_parent_commit_from_patch(
-    event: &Event,
-    git_repo: Option<&Repo>,
-) -> Result<String> {
+pub fn get_parent_commit_from_patch(event: &Event, git_repo: Option<&Repo>) -> Result<String> {
     if let Ok(parent) = tag_value(event, "parent-commit") {
         return Ok(parent);
     }
 
     let metadata = crate::mbox_parser::parse_mbox_patch(&event.content)
         .context("failed to parse patch for timestamp")?;
-    let timestamp = metadata.committer_timestamp.unwrap_or(metadata.author_timestamp);
+    let timestamp = metadata
+        .committer_timestamp
+        .unwrap_or(metadata.author_timestamp);
 
     if let Some(repo) = git_repo {
         if let Some(best_guess) = repo