Keep snippet visibility on error

When a snippet is submitted, but there's an error, we didn't keep the
visibility level. As the default is private, this means that submitting
a public snippet that failed would then fall back to being a private
snippet.

app/helpers/visibility_level_helper.rb

@@ -93,10 +93,6 @@ module VisibilityLevelHelper
     current_application_settings.default_project_visibility
   end
 
-  def default_snippet_visibility
-    current_application_settings.default_snippet_visibility
-  end
-
   def default_group_visibility
     current_application_settings.default_group_visibility
   end

app/models/snippet.rb

@@ -17,7 +17,7 @@ class Snippet < ActiveRecord::Base
     default_content_html_invalidator || file_name_changed?
   end
 
-  default_value_for :visibility_level, Snippet::PRIVATE
+  default_value_for(:visibility_level) { current_application_settings.default_snippet_visibility }
 
   belongs_to :author, class_name: 'User'
   belongs_to :project

app/views/projects/snippets/edit.html.haml

@@ -3,4 +3,4 @@
 %h3.page-title
   Edit Snippet
 %hr
-= render "shared/snippets/form", url: namespace_project_snippet_path(@project.namespace, @project, @snippet), visibility_level: @snippet.visibility_level
+= render "shared/snippets/form", url: namespace_project_snippet_path(@project.namespace, @project, @snippet)

app/views/projects/snippets/new.html.haml

@@ -3,4 +3,4 @@
 %h3.page-title
   New Snippet
 %hr
-= render "shared/snippets/form", url: namespace_project_snippets_path(@project.namespace, @project, @snippet), visibility_level: default_snippet_visibility
+= render "shared/snippets/form", url: namespace_project_snippets_path(@project.namespace, @project, @snippet)

app/views/shared/snippets/_form.html.haml

@@ -11,7 +11,7 @@
       .col-sm-10
         = f.text_field :title, class: 'form-control', required: true, autofocus: true
 
-    = render 'shared/visibility_level', f: f, visibility_level: visibility_level, can_change_visibility_level: true, form_model: @snippet
+    = render 'shared/visibility_level', f: f, visibility_level: @snippet.visibility_level, can_change_visibility_level: true, form_model: @snippet
 
     .file-editor
       .form-group
@@ -34,4 +34,3 @@
         = link_to "Cancel", namespace_project_snippets_path(@project.namespace, @project), class: "btn btn-cancel"
       - else
         = link_to "Cancel", snippets_path(@project), class: "btn btn-cancel"
-

app/views/snippets/edit.html.haml

@@ -2,4 +2,4 @@
 %h3.page-title
   Edit Snippet
 %hr
-= render 'shared/snippets/form', url: snippet_path(@snippet), visibility_level: @snippet.visibility_level
+= render 'shared/snippets/form', url: snippet_path(@snippet)

app/views/snippets/new.html.haml

@@ -2,4 +2,4 @@
 %h3.page-title
   New Snippet
 %hr
-= render "shared/snippets/form", url: snippets_path(@snippet), visibility_level: default_snippet_visibility
+= render "shared/snippets/form", url: snippets_path(@snippet)