Exclude info rows from milestone sorting items

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/javascripts/milestone.js.coffee

@@ -55,6 +55,7 @@ class Milestone
     $("#issues-list-unassigned, #issues-list-ongoing, #issues-list-closed").sortable(
       connectWith: ".issues-sortable-list",
       dropOnEmpty: true,
+      items: "li:not(.ui-sort-disabled)",
       update: (event, ui) ->
         data = $(this).sortable("serialize")
         Milestone.sortIssues(data)
@@ -83,6 +84,7 @@ class Milestone
     $("#merge_requests-list-unassigned, #merge_requests-list-ongoing, #merge_requests-list-closed").sortable(
       connectWith: ".merge_requests-sortable-list",
       dropOnEmpty: true,
+      items: "li:not(.ui-sort-disabled)",
       update: (event, ui) ->
         data = $(this).sortable("serialize")
         Milestone.sortMergeRequests(data)

app/views/projects/milestones/_issues.html.haml

@@ -3,4 +3,4 @@
   %ul{ class: "well-list issues-sortable-list", id: "issues-list-#{id}", "data-state" => id }
     - issues.sort_by(&:position).each do |issue|
       = render 'issue', issue: issue
-    %li.light Drag and drop available
+    %li.light.ui-sort-disabled Drag and drop available

app/views/projects/milestones/_merge_requests.html.haml

@@ -3,4 +3,4 @@
   %ul{ class: "well-list merge_requests-sortable-list", id: "merge_requests-list-#{id}", "data-state" => id }
     - merge_requests.sort_by(&:position).each do |merge_request|
       = render 'merge_request', merge_request: merge_request
-    %li.light Drag and drop available
+    %li.light.ui-sort-disabled Drag and drop available