Management: Fix changing admin rights (#2504)

src/components/right/management/ManageChatAdministrators.tsx

@@ -48,6 +48,8 @@ const ManageChatAdministrators: FC<OwnProps & StateProps> = ({
     onScreenSelect(ManagementScreens.GroupRecentActions);
   }, [onScreenSelect]);
 
+  const canAddNewAdmins = Boolean(chat.isCreator || chat.adminRights?.addAdmins);
+
   const adminMembers = useMemo(() => {
     if (!chat.fullInfo?.adminMembersById) {
       return [];
@@ -126,7 +128,7 @@ const ManageChatAdministrators: FC<OwnProps & StateProps> = ({
           ))}
 
           <FloatingActionButton
-            isShown
+            isShown={canAddNewAdmins}
             onClick={handleAddAdminClick}
             ariaLabel={lang('Channel.Management.AddModerator')}
           >

src/components/right/management/ManageGroupAdminRights.tsx

@@ -158,6 +158,10 @@ const ManageGroupAdminRights: FC<OwnProps & StateProps> = ({
       return true;
     }
 
+    if (chat.isCreator) {
+      return false;
+    }
+
     return !chat.adminRights![key];
   }, [chat, isFormFullyDisabled]);
 

src/components/right/management/ManageGroupMembers.tsx

@@ -135,7 +135,7 @@ const ManageGroupMembers: FC<OwnProps & StateProps> = ({
 
   const handleMemberClick = useCallback((id: string) => {
     if (noAdmins) {
-      onChatMemberSelect!(id, false);
+      onChatMemberSelect!(id, true);
       onScreenSelect!(ManagementScreens.ChatNewAdminRights);
     } else {
       closeManagement();