feat(task): add trace log of enqueued tasks

Refs: <pimalaya/himalaya#518>

CHANGELOG.md

@@ -7,8 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Added `trace` log of enqueued tasks. [himalaya#518]
+
 ## [0.2.2] - 2024-12-09
 
 Starting from this release, we maintain the git history and the changelogs as clean as possible. The documentation will come in the nearest releases.
 
 [0.2.2]: https://github.com/pimalaya/imap-client/releases/tag/v0.2.2
+
+[himalaya#518]: https://github.com/pimalaya/himalaya/issues/518

src/tasks/mod.rs

@@ -21,6 +21,7 @@ use imap_next::{
     Interrupt, State,
 };
 use thiserror::Error;
+use tracing::trace;
 
 /// Tells how a specific IMAP [`Command`] is processed.
 ///
@@ -110,15 +111,17 @@ impl Scheduler {
     {
         let tag = self.tag_generator.generate();
 
-        let cmd = {
+        let command = {
             let body = task.command_body();
             Command {
                 tag: tag.clone(),
                 body,
             }
         };
 
-        let handle = self.client_next.enqueue_command(cmd);
+        trace!(?command, "enqueue task");
+
+        let handle = self.client_next.enqueue_command(command);
 
         self.waiting_tasks.push_back(handle, tag, Box::new(task));