Remove sidebar toggle button swipe gesture handling

Remove logic for handling swipe gestures on the sidebar's toggle button.
Trying to perform a swipe on a target as small as the toggle button is
difficult and it doesn't offer advantages over just tapping the button
to open and close. Behavior that _might_ be useful is being able to
two-finger swipe on the whole sidebar to open or close it, but this conflicts
with the browser's own swipe gesture handling. Just remove it entirely
for now.

 - Remove swipe gesture handling

 - Remove unnecessary use of jQuery

 - Ensure that the `_setupGestures` code path is exercised by tests

src/annotator/sidebar.js

-import $ from 'jquery';
 import Hammer from 'hammerjs';
 
 import annotationCounts from './annotation-counts';
@@ -90,6 +89,11 @@ export default class Sidebar extends Host {
     this._setupSidebarEvents();
   }
 
+  destroy() {
+    this._hammerManager?.destroy();
+    super.destroy();
+  }
+
   _setupSidebarEvents() {
     annotationCounts(document.body, this.crossframe);
     sidebarTrigger(document.body, () => this.show());
@@ -117,27 +121,17 @@ export default class Sidebar extends Host {
   }
 
   _setupGestures() {
-    const toggle = $(this.toolbar.sidebarToggleButton);
-
-    if (toggle[0]) {
+    const toggleButton = this.toolbar.sidebarToggleButton;
+    if (toggleButton) {
       // Prevent any default gestures on the handle.
-      toggle.on('touchmove', e => e.preventDefault());
+      toggleButton.addEventListener('touchmove', e => e.preventDefault());
 
-      // Set up Hammer instance and handlers.
-      const manager = new Hammer.Manager(toggle[0])
-        // eslint-disable-next-line no-restricted-properties
-        .on('panstart panend panleft panright', this._onPan.bind(this))
+      this._hammerManager = new Hammer.Manager(toggleButton)
         // eslint-disable-next-line no-restricted-properties
-        .on('swipeleft swiperight', this._onSwipe.bind(this));
-
-      // Set up gesture recognition.
-      const pan = manager.add(
+        .on('panstart panend panleft panright', this._onPan.bind(this));
+      this._hammerManager.add(
         new Hammer.Pan({ direction: Hammer.DIRECTION_HORIZONTAL })
       );
-      const swipe = manager.add(
-        new Hammer.Swipe({ direction: Hammer.DIRECTION_HORIZONTAL })
-      );
-      swipe.recognizeWith(pan);
     }
   }
 
@@ -271,17 +265,6 @@ export default class Sidebar extends Host {
     }
   }
 
-  _onSwipe(event) {
-    switch (event.type) {
-      case 'swipeleft':
-        this.show();
-        break;
-      case 'swiperight':
-        this.hide();
-        break;
-    }
-  }
-
   show() {
     this.crossframe.call('sidebarOpened');
 

src/annotator/test/sidebar-test.js

@@ -15,6 +15,9 @@ describe('Sidebar', () => {
   let fakeCrossFrame;
   const sidebarConfig = { pluginClasses: {} };
 
+  // `Sidebar` instances created by current test.
+  let sidebars;
+
   let FakeToolbarController;
   let fakeToolbar;
 
@@ -32,7 +35,11 @@ describe('Sidebar', () => {
     }
     config = Object.assign({}, sidebarConfig, config);
     const element = document.createElement('div');
-    return new Sidebar(element, config);
+    const sidebar = new Sidebar(element, config);
+
+    sidebars.push(sidebar);
+
+    return sidebar;
   };
 
   const createExternalContainer = () => {
@@ -44,8 +51,6 @@ describe('Sidebar', () => {
   };
 
   beforeEach(() => {
-    sandbox.stub(Sidebar.prototype, '_setupGestures');
-
     fakeCrossFrame = {};
     fakeCrossFrame.onConnect = sandbox.stub().returns(fakeCrossFrame);
     fakeCrossFrame.on = sandbox.stub().returns(fakeCrossFrame);
@@ -75,6 +80,8 @@ describe('Sidebar', () => {
     sidebarConfig.pluginClasses.CrossFrame = CrossFrame;
     sidebarConfig.pluginClasses.BucketBar = BucketBar;
 
+    sidebars = [];
+
     $imports.$mock({
       './toolbar': {
         ToolbarController: FakeToolbarController,
@@ -83,6 +90,7 @@ describe('Sidebar', () => {
   });
 
   afterEach(() => {
+    sidebars.forEach(s => s.destroy());
     sandbox.restore();
     $imports.$restore();
   });
@@ -361,26 +369,6 @@ describe('Sidebar', () => {
     });
   });
 
-  describe('swipe gestures', () => {
-    let sidebar;
-
-    beforeEach(() => {
-      sidebar = createSidebar({});
-    });
-
-    it('opens the sidebar on swipeleft', () => {
-      const show = sandbox.stub(sidebar, 'show');
-      sidebar._onSwipe({ type: 'swipeleft' });
-      assert.calledOnce(show);
-    });
-
-    it('closes the sidebar on swiperight', () => {
-      const hide = sandbox.stub(sidebar, 'hide');
-      sidebar._onSwipe({ type: 'swiperight' });
-      assert.calledOnce(hide);
-    });
-  });
-
   describe('destruction', () => {
     let sidebar;