Support include_blank

app/presenters/hotwire_combobox/listbox/item.rb

@@ -14,18 +14,22 @@ def initialize(view, options, render_in, include_blank:, **custom_methods)
   end
 
   def items
-    if grouped?
-      create_listbox_group options
-    else
-      items = create_listbox_options options
-      items.unshift(blank_option) if include_blank.present?
-      items
-    end
+    items = groups_or_options
+    items.unshift(blank_option) if include_blank.present?
+    items
   end
 
   private
     attr_reader :view, :options, :render_in, :include_blank, :custom_methods
 
+    def groups_or_options
+      if grouped?
+        create_listbox_group options
+      else
+        create_listbox_options options
+      end
+    end
+
     def grouped?
       key, value = options.to_a.first
       value.is_a? Array

test/dummy/app/views/comboboxes/grouped_options.html.erb

@@ -13,3 +13,4 @@
 
 <%= combobox_tag "state", State.all.group_by(&:location), id: "state-field" %>
 <%= combobox_tag "state_but_weird", weird_options, id: "weird-state-field" %>
+<%= combobox_tag "state_with_blank", State.all.group_by(&:location), id: "state-field-with-blank", include_blank: "All" %>

test/system/hotwire_combobox_test.rb

@@ -1085,6 +1085,16 @@ class HotwireComboboxTest < ApplicationSystemTestCase
 
     type_in_combobox "#weird-state-field", :down
     assert_selected_option_with text: "United States"
+
+    open_combobox "#state-field-with-blank"
+    assert_option_with class: ".hw-combobox__option--blank", text: "All"
+    assert_group_with text: "South"
+    assert_option_with text: "Alabama"
+
+    type_in_combobox "#state-field-with-blank", :down
+    assert_selected_option_with text: "All"
+    type_in_combobox "#state-field-with-blank", :down
+    assert_selected_option_with text: "Alabama"
   end
 
   private