Identify input created by FlatpickrEditor as belonging to HOT

lib/editors/FlatpickrEditor.js

@@ -31,10 +31,11 @@ class FlatpickrEditor extends Handsontable.editors.TextEditor {
 
     this.TEXTAREA = this.hot.rootDocument.createElement('input');
     this.TEXTAREA.className = 'handsontableInput';
+    this.TEXTAREA.setAttribute('data-hot-input', true);
     this.textareaStyle = this.TEXTAREA.style;
     this.textareaStyle.width = 0;
     this.textareaStyle.height = 0;
-    Handsontable.dom.empty(this.TEXTAREA_PARENT);
+    this.TEXTAREA_PARENT.innerText = '';
     this.TEXTAREA_PARENT.appendChild(this.TEXTAREA);
 
     this.datePicker = this.hot.rootDocument.createElement('DIV');
@@ -52,10 +53,10 @@ class FlatpickrEditor extends Handsontable.editors.TextEditor {
      */
     const eventManager = new Handsontable.EventManager(this);
     eventManager.addEventListener(this.datePicker, 'mousedown', (event) => {
-      Handsontable.dom.stopImmediatePropagation(event);
+      event.stopPropagation();
     });
     eventManager.addEventListener(this.datePicker, 'keydown', (event) => {
-      Handsontable.dom.stopImmediatePropagation(event);
+      event.stopPropagation();
     });
     eventManager.addEventListener(this.TEXTAREA, 'keydown', (event) => {
       if (event.keyCode === Handsontable.helper.KEY_CODES.ENTER) {
@@ -112,6 +113,7 @@ class FlatpickrEditor extends Handsontable.editors.TextEditor {
    */
   close() {
     this._opened = false;
+    this.fp && this.fp.destroy();
     this.removeHooksByKey('beforeKeyDown');
     super.close();
   }
@@ -141,8 +143,8 @@ class FlatpickrEditor extends Handsontable.editors.TextEditor {
    */
   showDatepicker(event) {
     const offset = this.TD.getBoundingClientRect();
-    const isMouseDown = this.instance.view.isMouseDown();
-    const isMeta = event ? Handsontable.helper.isMetaKey(event.keyCode) : false;
+    const isMouseDown = this.hot.view.isMouseDown();
+    const isMeta = event ? Handsontable.helper.isFunctionKey(event.keyCode) : false;
 
     const defaultConfig = this.getFlatpickrConfig();
     const cellConfig =