max selected choices not work tagbox with lazy loading

src/base.ts

@@ -564,8 +564,9 @@ export class Base {
       !!this.arraysInfo &&
       (!val || Array.isArray(val))
     ) {
-      if (this.isTwoValueEquals(oldValue, val)) return;
-      this.setArrayPropertyDirectly(name, val);
+      if (!this.isTwoValueEquals(oldValue, val)) {
+        this.setArrayPropertyDirectly(name, val);
+      }
     } else {
       this.setPropertyValueDirectly(name, val);
       if (!this.isDisposedValue && !this.isTwoValueEquals(oldValue, val)) {

src/question_baseselect.ts

@@ -864,15 +864,18 @@ export class QuestionSelectBase extends Question {
     }
     return res;
   }
-  protected updateVisibleChoices() {
-    if (this.isLoadingFromJson) return;
+  protected updateVisibleChoices(): void {
+    if (this.isLoadingFromJson || this.isDisposed) return;
     var newValue = new Array<ItemValue>();
     var calcValue = this.calcVisibleChoices();
     if (!calcValue) calcValue = [];
     for (var i = 0; i < calcValue.length; i++) {
       newValue.push(calcValue[i]);
     }
-    this.setPropertyValue("visibleChoices", newValue);
+    const oldValue = this.visibleChoices;
+    if(!this.isTwoValueEquals(oldValue, newValue) || this.choicesLazyLoadEnabled) {
+      this.setArrayPropertyDirectly("visibleChoices", newValue);
+    }
   }
   private calcVisibleChoices(): Array<ItemValue> {
     if (this.canUseFilteredChoices()) return this.getFilteredChoices();

tests/question_tagbox_tests.ts

@@ -1320,3 +1320,130 @@ QUnit.test("question.showClearButton", assert => {
   assert.equal(q.showClearButton, true, "Creator V2");
   settings.supportCreatorV2 = false;
 });
+QUnit.test("lazy loading: maxSelectedChoices limit stops working if you clear the value", assert => {
+  const done1 = assert.async();
+  const done2 = assert.async();
+  const json = {
+    questions: [{
+      "type": "tagbox",
+      "name": "q1",
+      "defaultValue": [1],
+      "choicesLazyLoadEnabled": true,
+      "choicesLazyLoadPageSize": 30,
+      "maxSelectedChoices": 2
+    }]
+  };
+  const survey = new SurveyModel(json);
+  survey.onChoicesLazyLoad.add(callback);
+
+  const question = <QuestionTagboxModel>survey.getAllQuestions()[0];
+  const dropdownListModel = question.dropdownListModel;
+  const list: MultiSelectListModel = dropdownListModel.popupModel.contentComponentData.model as MultiSelectListModel;
+  assert.equal(question.choicesLazyLoadEnabled, true);
+  assert.equal(question.choices.length, 0);
+
+  question.dropdownListModel.popupModel.toggleVisibility();
+  setTimeout(() => {
+    assert.deepEqual(question.value, [1]);
+    assert.equal(question.choices.length, 30);
+    for(let index = 0; index < list.actions.length - 1; index++) {
+      assert.ok(list.actions[index].enabled, list.actions[index].id + " is enabled before clear");
+    }
+
+    list.onItemClick(list.actions[1]);
+    assert.deepEqual(question.value, [1, 2]);
+    assert.ok(list.actions[0].enabled, "action 1 is enabled before clear");
+    assert.ok(list.actions[1].enabled, "action 2 is enabled before clear");
+    for(let index = 2; index < list.actions.length - 1; index++) {
+      assert.notOk(list.actions[index].enabled, list.actions[index].id + " is disabled before clear");
+    }
+    question.dropdownListModel.popupModel.isVisible = false;
+    question.dropdownListModel.onClear({
+      keyCode: 0,
+      preventDefault: () => { },
+      stopPropagation: () => { }
+    });
+
+    question.dropdownListModel.popupModel.toggleVisibility();
+    setTimeout(() => {
+      assert.deepEqual(question.value, [], "question value is empty");
+      list.onItemClick(list.actions[0]);
+      assert.deepEqual(question.value, [1], "question value is [1]");
+
+      for(let index = 0; index < list.actions.length - 1; index++) {
+        assert.ok(list.actions[index].enabled, list.actions[index].id + " is enabled after clear");
+      }
+
+      list.onItemClick(list.actions[1]);
+      assert.deepEqual(question.value, [1, 2], "question value is [1, 2] after clear");
+      assert.ok(list.actions[0].enabled, "action 1 is enabled after clear");
+      assert.ok(list.actions[1].enabled, "action 2 is enabled after clear");
+      for(let index = 2; index < list.actions.length - 1; index++) {
+        assert.notOk(list.actions[index].enabled, list.actions[index].id + " is disabled after clear");
+      }
+
+      done2();
+    }, onChoicesLazyLoadCallbackTimeOut + callbackTimeOutDelta);
+
+    done1();
+  }, onChoicesLazyLoadCallbackTimeOut + callbackTimeOutDelta);
+});
+QUnit.test("lazy loading & maxSelectedChoices: Items remains disabled when unselecting choices within a drop-down list", assert => {
+  const done1 = assert.async();
+  const done2 = assert.async();
+  const json = {
+    questions: [{
+      "type": "tagbox",
+      "name": "q1",
+      "defaultValue": [1],
+      "choicesLazyLoadEnabled": true,
+      "choicesLazyLoadPageSize": 30,
+      "maxSelectedChoices": 2
+    }]
+  };
+  const survey = new SurveyModel(json);
+  survey.onChoicesLazyLoad.add(callback);
+
+  const question = <QuestionTagboxModel>survey.getAllQuestions()[0];
+  const dropdownListModel = question.dropdownListModel;
+  const list: MultiSelectListModel = dropdownListModel.popupModel.contentComponentData.model as MultiSelectListModel;
+  assert.equal(question.choicesLazyLoadEnabled, true);
+  assert.equal(question.choices.length, 0);
+
+  question.dropdownListModel.popupModel.toggleVisibility();
+  setTimeout(() => {
+    assert.deepEqual(question.value, [1]);
+    assert.equal(question.choices.length, 30);
+    for(let index = 0; index < list.actions.length - 1; index++) {
+      assert.ok(list.actions[index].enabled, list.actions[index].id + " is enabled before unselecting choice");
+    }
+
+    list.onItemClick(list.actions[1]);
+    assert.deepEqual(question.value, [1, 2]);
+    assert.ok(list.actions[0].enabled, "action 1 is enabled before unselecting choice");
+    assert.ok(list.actions[1].enabled, "action 2 is enabled before unselecting choice");
+    for(let index = 2; index < list.actions.length - 1; index++) {
+      assert.notOk(list.actions[index].enabled, list.actions[index].id + " is disabled before unselecting choice");
+    }
+    question.dropdownListModel.popupModel.isVisible = false;
+    question.dropdownListModel.popupModel.toggleVisibility();
+    setTimeout(() => {
+      assert.deepEqual(question.value, [1, 2], "question value is [1, 2]");
+      assert.ok(list.actions[0].enabled, "action 1 is enabled");
+      assert.ok(list.actions[1].enabled, "action 2 is enabled");
+      for(let index = 2; index < list.actions.length - 1; index++) {
+        assert.notOk(list.actions[index].enabled, list.actions[index].id + " is disabled");
+      }
+
+      list.onItemClick(list.actions[1]);
+      assert.deepEqual(question.value, [1], "question value is [1]");
+      for(let index = 0; index < list.actions.length - 1; index++) {
+        assert.ok(list.actions[index].enabled, list.actions[index].id + " is enabled after unselecting choice");
+      }
+
+      done2();
+    }, onChoicesLazyLoadCallbackTimeOut + callbackTimeOutDelta);
+
+    done1();
+  }, onChoicesLazyLoadCallbackTimeOut + callbackTimeOutDelta);
+});