threads: check for new notes locally when thread is re-opened

We have a NoteRef cache for threads in memory, which is just a list of
NoteKeys and timestamps.

When reopening a thread, query the local DB to see if there are any new
notes that we might have missed because we weren't actively subscribed
to them.

Signed-off-by: William Casarin <jb55@jb55.com>

src/ui/thread.rs

@@ -79,7 +79,11 @@ impl<'a> ThreadView<'a> {
                 }
 
                 let (len, list) = {
-                    let thread = self.app.threads.thread_mut(&self.app.ndb, &txn, root_id);
+                    let thread = self
+                        .app
+                        .threads
+                        .thread_mut(&self.app.ndb, &txn, root_id)
+                        .get_ptr();
 
                     let len = thread.view.notes.len();
                     (len, &mut thread.view.list)
@@ -92,7 +96,11 @@ impl<'a> ThreadView<'a> {
                         ui.spacing_mut().item_spacing.x = 4.0;
 
                         let note_key = {
-                            let thread = self.app.threads.thread_mut(&self.app.ndb, &txn, root_id);
+                            let thread = self
+                                .app
+                                .threads
+                                .thread_mut(&self.app.ndb, &txn, root_id)
+                                .get_ptr();
                             thread.view.notes[start_index].key
                         };