FIX: category custom slug can't be set when generation method is none

app/models/category.rb

@@ -207,7 +207,7 @@ SQL
 
     if slug.present?
       # santized custom slug
-      self.slug = Slug.for(slug, '')
+      self.slug = Slug.sanitize(slug)
       errors.add(:slug, 'is already in use') if duplicate_slug?
     else
       # auto slug

lib/slug.rb

@@ -13,6 +13,10 @@ module Slug
     slug.blank? ? default : slug
   end
 
+  def self.sanitize(string)
+    self.encoded_generator(string)
+  end
+
   private
 
   def self.ascii_generator(string)

spec/controllers/categories_controller_spec.rb

@@ -232,15 +232,21 @@ describe CategoriesController do
       it 'accepts valid custom slug' do
         xhr :put, :update_slug, category_id: @category.id, slug: 'valid-slug'
         expect(response).to be_success
-        category = Category.find(@category.id)
-        expect(category.slug).to eq('valid-slug')
+        expect(@category.reload.slug).to eq('valid-slug')
       end
 
       it 'accepts not well formed custom slug' do
         xhr :put, :update_slug, category_id: @category.id, slug: ' valid slug'
         expect(response).to be_success
-        category = Category.find(@category.id)
-        expect(category.slug).to eq('valid-slug')
+        expect(@category.reload.slug).to eq('valid-slug')
+      end
+
+      it 'accepts and sanitize custom slug when the slug generation method is not english' do
+        SiteSetting.slug_generation_method = 'none'
+        xhr :put, :update_slug, category_id: @category.id, slug: ' another !_ slug @'
+        expect(response).to be_success
+        expect(@category.reload.slug).to eq('another-slug')
+        SiteSetting.slug_generation_method = 'ascii'
       end
 
       it 'rejects invalid custom slug' do