#188

backend/app/controllers/wiki_pages_controller.rb

@@ -49,7 +49,7 @@ class WikiPagesController < ApplicationController
       case change.action
       when ?=
         { type: 'context', content: change.old_element }
-      when ?|
+      when ?!
         [{ type: 'removed', content: change.old_element },
          { type: 'added', content: change.new_element }]
       when ?+
@@ -98,13 +98,18 @@ class WikiPagesController < ApplicationController
     return head :unprocessable_entity if title.blank? || body.blank?
 
     page = WikiPage.find(params[:id])
+    base_revision_id = page.current_revision.id
 
     if params[:title].present? && params[:title].strip != page.title
       return head :unprocessable_entity
     end
 
     message = params[:message].presence
-    Wiki::Commit.content!(page:, body:, created_user: current_user, message:)
+    Wiki::Commit.content!(page:,
+                          body:,
+                          created_user: current_user,
+                          message:,
+                          base_revision_id:)
 
     head :ok
   end