Fixed issue notes being duplicated

Closes #44099

app/assets/javascripts/notes/stores/actions.js

@@ -197,7 +197,7 @@ const pollSuccessCallBack = (resp, commit, state, getters) => {
     });
   }
 
-  commit(types.SET_LAST_FETCHED_AT, resp.lastFetchedAt);
+  commit(types.SET_LAST_FETCHED_AT, resp.last_fetched_at);
 
   return resp;
 };

app/assets/javascripts/notes/stores/mutations.js

@@ -90,15 +90,15 @@ export default {
     const notes = [];
 
     notesData.forEach((note) => {
-      const nn = Object.assign({}, note);
-
       // To support legacy notes, should be very rare case.
       if (note.individual_note && note.notes.length > 1) {
         note.notes.forEach((n) => {
+          const nn = Object.assign({}, note);
           nn.notes = [n]; // override notes array to only have one item to mimick individual_note
           notes.push(nn);
         });
       } else {
+        const nn = Object.assign({}, note);
         const oldNote = utils.findNoteObjectById(state.notes, note.id);
         nn.expanded = oldNote ? oldNote.expanded : note.expanded;
 

app/helpers/notes_helper.rb

@@ -169,7 +169,7 @@ module NotesHelper
       reopenPath: reopen_issuable_path(issuable),
       notesPath: notes_url,
       totalNotes: issuable.discussions.length,
-      lastFetchedAt: Time.now
+      lastFetchedAt: Time.now.to_i
 
     }.to_json
   end