After selecting for example the zoom level "page fit", if would be intuitive and desirable to be able to navigate the document using the arrow keys. Right now pressing an arrow key (even and especially left/right) changes the zoom level, although you just selected the desirable zoom level manually.

EDIT: the same thing holds for the page up and page down keys.

/* Copyright 2016 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import {
  animationStarted,
  DEFAULT_SCALE,
  DEFAULT_SCALE_VALUE,
  MAX_SCALE,
  MIN_SCALE,
  noContextMenuHandler,
} from "./ui_utils.js";
const PAGE_NUMBER_LOADING_INDICATOR = "visiblePageIsLoading";
const SCALE_SELECT_CONTAINER_WIDTH = 140; 
const SCALE_SELECT_WIDTH = 162;