Fix selection via enter key

Regressed in #37

app/assets/javascripts/hw_combobox/models/combobox/selection.js

@@ -71,9 +71,9 @@ Combobox.Selection = Base => class extends Base {
     }
   }
 
-  _selectFuzzyMatch() {
-    if (this._isFuzzyMatch) {
-      this._select(this._visibleOptionElements[0], { force: true })
+  _ensureSelection() {
+    if (this._shouldEnsureSelection) {
+      this._select(this._ensurableOption, { force: true })
       this.filter(nullEvent)
     }
   }
@@ -82,7 +82,11 @@ Combobox.Selection = Base => class extends Base {
     return this.hiddenFieldTarget.value && !this._selectedOptionElement
   }
 
-  get _isFuzzyMatch() {
-    return this._isQueried && !!this._visibleOptionElements[0] && !this._isNewOptionWithPotentialMatches
+  get _shouldEnsureSelection() {
+    return this._isQueried && !!this._ensurableOption && !this._isNewOptionWithPotentialMatches
+  }
+
+  get _ensurableOption() {
+    return this._selectedOptionElement || this._visibleOptionElements[0]
   }
 }

app/assets/javascripts/hw_combobox/models/combobox/toggle.js

@@ -50,10 +50,6 @@ Combobox.Toggle = Base => class extends Base {
     return clientX >= left && clientX <= right && clientY >= top && clientY <= bottom
   }
 
-  _ensureSelection() {
-    this._selectFuzzyMatch()
-  }
-
   _openByFocusing() {
     this._actingCombobox.focus()
   }

test/system/hotwire_combobox_test.rb

@@ -108,6 +108,19 @@ class HotwireComboboxTest < ApplicationSystemTestCase
     assert_selected_option_with selector: ".hw-combobox__option--selected", text: "Florida"
   end
 
+  test "selecting with the keyboard" do
+    visit html_options_path
+
+    open_combobox "#state-field"
+    type_in_combobox "#state-field", "mi"
+    type_in_combobox "#state-field", :down, :down
+    assert_selected_option_with text: "Mississippi"
+
+    type_in_combobox "#state-field", :enter
+    assert_closed_combobox
+    assert_combobox_display_and_value "#state-field", "Mississippi", "MS"
+  end
+
   test "pressing enter locks in the current selection, but editing the text field resets it" do
     visit html_options_path