Update MaterialDropdownSelect to hide item from the option list when getSelectable(item) call returns SelectableOption.Hidden

PiperOrigin-RevId: 179590775

Author: Googler

lib/material_select/material_dropdown_select.dart

@@ -465,6 +465,15 @@ class MaterialDropdownSelectComponent extends MaterialSelectBase
     return false;
   }
 
+  /// Whether to hide [item].
+  bool isOptionHidden(Object item) {
+    if (options is Selectable) {
+      return (options as Selectable).getSelectable(item) ==
+          SelectableOption.Hidden;
+    }
+    return false;
+  }
+
   /// Whether to show select item that deselects the current selection.
   bool get showDeselectItem =>
       !isMultiSelect && deselectLabel?.isNotEmpty == true;

lib/material_select/material_dropdown_select.html

@@ -81,6 +81,7 @@
                 [factoryRenderer]="factoryRenderer"
                 [selection]="selection"
                 [disabled]="isOptionDisabled(item)"
+                [isHidden]="isOptionHidden(item)"
                 [value]="item"
                 [active]="activeModel.isActive(item)"
                 [attr.id]="activeModel.id(item)"

lib/material_select/material_select_dropdown_item.dart

@@ -23,6 +23,7 @@ import 'package:angular_components/utils/browser/dom_service/dom_service.dart';
   host: const {
     'class': 'item',
     '[class.disabled]': 'disabled',
+    '[class.hidden]': 'isHidden',
     '[class.active]': 'active',
     '[class.selected]': 'isSelected',
     '[class.multiselect]': 'supportsMultiSelect',

lib/material_select/material_select_dropdown_item.scss

@@ -21,6 +21,10 @@
     color: $mat-lighter-transparent-black;
     cursor: default;
   }
+
+  &.hidden {
+    display: none;
+  }
 }
 
 .check-container {

lib/material_select/material_select_item.dart

@@ -27,6 +27,7 @@ import 'package:angular_components/utils/disposer/disposer.dart';
   host: const {
     'class': 'item',
     '[class.disabled]': 'disabled',
+    '[class.hidden]': 'isHidden',
     '[class.selected]': 'isSelected',
     '[class.multiselect]': 'supportsMultiSelect',
     'tabindex': '0',
@@ -78,6 +79,17 @@ class MaterialSelectItemComponent extends ButtonDirective
       ..addFunction(() => _selectionChangeStreamSub?.cancel());
   }
 
+  /// Whether the item should be hidden.
+  ///
+  /// False by default.
+  bool get isHidden => _isHidden;
+  @Input()
+  set isHidden(value) {
+    _isHidden = getBool(value);
+  }
+
+  bool _isHidden = false;
+
   /// The value this selection item represents.
   ///
   /// If the object implements [HasUIDisplayName], it will render use