双页模式在鼠标操作场景下有bug

[hathlife]

测试环境：Windows 11 x64 3840x2160 250%画面缩放 1.当切换到双页模式时，点击下方弹出缩略图无法正常跳转显示页数，也无法通过鼠标点按拖动翻页 2.双页模式下无法滚轮缩放 2.切换到双页模式时，view_page.dart中定义的以下快捷键会失灵：

        // 按键对应的事件
        Map<LogicalKeyboardKey, Function> actionMap = {
          LogicalKeyboardKey.arrowLeft: controller.tapLeft,
          LogicalKeyboardKey.arrowUp: controller.toPrev,
          LogicalKeyboardKey.arrowRight: controller.tapRight,
          LogicalKeyboardKey.arrowDown: controller.toNext,
          LogicalKeyboardKey.pageUp: controller.toPrev,
          LogicalKeyboardKey.pageDown: controller.toNext,

//......................

          LogicalKeyboardKey.equal: controller.scaleUp,
          LogicalKeyboardKey.minus: controller.scaleDown,
//......................
        };