FIX: Correctly set categoryId on Composer model (#23934)

spec/system/page_objects/components/composer.rb

@@ -10,6 +10,10 @@ module PageObjects
         page.has_css?("#{COMPOSER_ID}.open")
       end
 
+      def closed?
+        page.has_css?("#{COMPOSER_ID}.closed", visible: :all)
+      end
+
       def open_composer_actions
         find(".composer-action-title .btn").click
         self
@@ -30,6 +34,12 @@ module PageObjects
         self
       end
 
+      def append_content(content)
+        current_content = composer_input.value
+        composer_input.set(current_content + content)
+        self
+      end
+
       def fill_form_template_field(field, content)
         form_template_field(field).fill_in(with: content)
         self
@@ -90,6 +100,10 @@ module PageObjects
         find("#{COMPOSER_ID} .d-editor-preview-wrapper")
       end
 
+      def has_discard_draft_modal?
+        page.has_css?(".discard-draft-modal")
+      end
+
       def has_emoji_autocomplete?
         has_css?(AUTOCOMPLETE_MENU)
       end