[Users] Add a size limit to the body of feedback

app/models/user_feedback.rb

@@ -4,6 +4,7 @@ class UserFeedback < ApplicationRecord
   belongs_to_creator
   validates :body, :category, presence: true
   validates :category, inclusion: { in: %w[positive negative neutral] }
+  validates :body, length: { minimum: 1, maximum: Danbooru.config.user_feedback_max_size }
   validate :creator_is_moderator, on: :create
   validate :user_is_not_creator
   after_save :create_dmail

app/views/user_feedbacks/_form.html.erb

@@ -6,6 +6,6 @@
   <% unless user_feedback.new_record? %>
     <%= f.input :send_update_dmail, label: "Send update DMail", as: :boolean %>
   <% end %>
-  <%= f.input :body, as: :dtext %>
+  <%= f.input :body, as: :dtext, limit: Danbooru.config.user_feedback_max_size %>
   <%= f.button :submit, "Submit" %>
 <% end %>

config/danbooru_default_config.rb

@@ -329,6 +329,10 @@ module Danbooru
       250_000
     end
 
+    def user_feedback_max_size
+      20_000
+    end
+
     def discord_site
     end