fix: Fix bug that prevented using keyboard shortcuts when the DropDownDiv is open. (#9085)

* fix: Fix bug that prevented using keyboard shortcuts when the DropDownDiv is open.

* chore: Remove obsolete comment.

* Refactor: Remove unreachable null check.

* chore: Add tests for handling Escape to dismiss the Widget/DropDownDivs.

* chore: Satisfy the linter.

* fix: Fix post-merge test failure.

tests/mocha/dropdowndiv_test.js

@@ -136,6 +136,39 @@ suite('DropDownDiv', function () {
     });
   });
 
+  suite('Keyboard Shortcuts', function () {
+    setup(function () {
+      this.boundsStub = sinon
+        .stub(Blockly.DropDownDiv.TEST_ONLY, 'getBoundsInfo')
+        .returns({
+          left: 0,
+          right: 100,
+          top: 0,
+          bottom: 100,
+          width: 100,
+          height: 100,
+        });
+      this.workspace = Blockly.inject('blocklyDiv', {});
+    });
+    teardown(function () {
+      this.boundsStub.restore();
+    });
+    test('Escape dismisses DropDownDiv', function () {
+      let hidden = false;
+      Blockly.DropDownDiv.show(this, false, 0, 0, 0, 0, false, () => {
+        hidden = true;
+      });
+      assert.isFalse(hidden);
+      Blockly.DropDownDiv.getContentDiv().dispatchEvent(
+        new KeyboardEvent('keydown', {
+          key: 'Escape',
+          keyCode: 27, // example values.
+        }),
+      );
+      assert.isTrue(hidden);
+    });
+  });
+
   suite('show()', function () {
     test('without bounds set throws error', function () {
       const block = this.setUpBlockWithField();

tests/mocha/widget_div_test.js

@@ -287,6 +287,29 @@ suite('WidgetDiv', function () {
     });
   });
 
+  suite('Keyboard Shortcuts', function () {
+    test('Escape dismisses WidgetDiv', function () {
+      let hidden = false;
+      Blockly.WidgetDiv.show(
+        this,
+        false,
+        () => {
+          hidden = true;
+        },
+        this.workspace,
+        false,
+      );
+      assert.isFalse(hidden);
+      Blockly.WidgetDiv.getDiv().dispatchEvent(
+        new KeyboardEvent('keydown', {
+          key: 'Escape',
+          keyCode: 27, // example values.
+        }),
+      );
+      assert.isTrue(hidden);
+    });
+  });
+
   suite('show()', function () {
     test('shows nowhere', function () {
       const block = this.setUpBlockWithField();