Preload issue relations when exporting issues to CSV with all columns (#16091).

git-svn-id: http://svn.redmine.org/redmine/trunk@12910 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/issues_controller.rb

@@ -62,6 +62,9 @@ class IssuesController < ApplicationController
       case params[:format]
       when 'csv', 'pdf'
         @limit = Setting.issues_export_limit.to_i
+        if params[:columns] == 'all'
+          @query.column_names = @query.available_inline_columns.map(&:name)
+        end
       when 'atom'
         @limit = Setting.feeds_limit.to_i
       when 'xml', 'json'