Fixed following by unread

src/lib/appManagers/appImManager.ts

@@ -2796,7 +2796,7 @@ export class AppImManager {
     if(result instanceof Promise) {
       cached = false;
       promise = result.then((result) => {
-        this.log('getHistory not cached result by maxID:', maxID, reverse, isBackLimit, result, peerID);
+        this.log('getHistory not cached result by maxID:', maxID, reverse, isBackLimit, result, peerID, justLoad);
         
         if(justLoad) {
           this.scrollable.onScroll(); // нужно делать из-за ранней прогрузки
@@ -2821,7 +2821,7 @@ export class AppImManager {
       return null;
     } else {
       cached = true;
-      this.log('getHistory cached result by maxID:', maxID, reverse, isBackLimit, result, peerID);
+      this.log('getHistory cached result by maxID:', maxID, reverse, isBackLimit, result, peerID, justLoad);
       promise = this.performHistoryResult(result.history || [], reverse, isBackLimit, additionMsgID);
       //return (reverse ? this.getHistoryTopPromise = promise : this.getHistoryBottomPromise = promise);
       //return this.performHistoryResult(result.history || [], reverse, isBackLimit, additionMsgID, true);

src/lib/appManagers/appMessagesManager.ts

@@ -4166,7 +4166,7 @@ export class AppMessagesManager {
         }
       }
 
-      var history = historyStorage.history.slice(offset, offset + limit);
+      let history = historyStorage.history.slice(backLimit ? Math.max(offset - backLimit, 0) : offset, offset + limit);
       if(!maxID && historyStorage.pending.length) {
         history = historyStorage.pending.slice().concat(history);
       }