Allow moving sections between storylines

The order endpoint previously only searched for sections within the
target chapter's storyline. This prevented moving sections from one
storyline to another.

REDMINE-21135

Author: tf

entry_types/scrolled/app/controllers/pageflow_scrolled/editor/sections_controller.rb

@@ -41,11 +41,10 @@ def destroy
 
       def order
         chapter = Chapter.all_for_revision(@entry.draft).find(params[:chapter_id])
-        storyline = chapter.storyline
 
         params.require(:ids).each_with_index do |id, index|
-          storyline.sections.find(id).update(chapter_id: chapter.id,
-                                             position: index)
+          Section.all_for_revision(@entry.draft).find(id).update(chapter_id: chapter.id,
+                                                                 position: index)
         end
 
         head :no_content

entry_types/scrolled/spec/controllers/pageflow_scrolled/editor/sections_controller_spec.rb

@@ -271,6 +271,27 @@ module PageflowScrolled
         expect(section.reload.chapter).to eq(other_chapter)
       end
 
+      it 'allows moving a section from a different storyline' do
+        entry = create(:entry, type_name: 'scrolled')
+        revision = entry.draft
+        storyline = create(:scrolled_storyline, revision:)
+        chapter = create(:scrolled_chapter, storyline:)
+        other_storyline = create(:scrolled_storyline, revision:)
+        other_chapter = create(:scrolled_chapter, storyline: other_storyline)
+        section = create(:section, chapter: other_chapter)
+
+        authorize_for_editor_controller(entry)
+        put(:order,
+            params: {
+              entry_type: 'scrolled',
+              entry_id: entry,
+              chapter_id: chapter,
+              ids: [section.id]
+            }, format: 'json')
+
+        expect(section.reload.chapter).to eq(chapter)
+      end
+
       it 'does not allow moving a section to a chapter of another entry' do
         entry = create(:entry, type_name: 'scrolled')
         chapter = create(:scrolled_chapter, revision: entry.draft)