Update show attribute when refreshing to correctly hide the field when unselected

Previously it would hang around and bleed in the terms input

app/javascript/controllers/multi_selection_combobox_controller.js

@@ -26,12 +26,14 @@ export default class extends Controller {
   refresh() {
     this.labelTarget.textContent = this.#selectedLabel
     this.#updateHiddenFields()
+    this.#updateFilterShow()
   }
 
   clear(event) {
     this.#deselectAll()
     this.#updateHiddenFields()
     this.labelTarget.textContent = this.#selectedLabel
+    this.#updateFilterShow()
   }
 
   get #selectedLabel() {
@@ -80,6 +82,7 @@ export default class extends Controller {
   #updateHiddenFields() {
     this.#clearHiddenFields()
     this.#addHiddenFields()
+    this.#updateFilterShow()
   }
 
   #deselectAll() {
@@ -122,4 +125,9 @@ export default class extends Controller {
       this.element.appendChild(field)
     })
   }
+
+  #updateFilterShow() {
+    const hasSelection = this.#selectedValues().length > 0
+    this.element.setAttribute("data-filter-show", hasSelection)
+  }
 }