FIX: Toggling categories was requiring two clicks (#134)

assets/javascripts/discourse/controllers/docs-index.js

@@ -292,7 +292,7 @@ export default Controller.extend({
   @action
   updateSelectedCategories(category) {
     const filterCategories =
-      category.id === this.filterCategories ? null : category.id;
+      category.id === parseInt(this.filterCategories, 10) ? null : category.id;
     this.setProperties({
       filterCategories,
       selectedTopic: null,

test/javascripts/acceptance/docs-test.js

@@ -63,6 +63,13 @@ acceptance("Docs", function (needs) {
 
     await click(".docs-item.docs-category");
     assert.equal(count(".docs-category.selected"), 1);
+
+    await click(".docs-item.docs-category");
+    assert.equal(
+      count(".docs-category.selected"),
+      0,
+      "clicking again deselects"
+    );
   });
 });