fixes milestone dropdown not select issue

changelog entry added

adds merge request number

adds test for milestone dropdown selected text

removes calling unnecessary escape function

adds changelog entry in 8.13.2 and removed redundant changelog sections

moves changelog entry to 8.14 as there is conflict

CHANGELOG.md

 Please view this file on the master branch, on stable branches it's out of date.
 
 ## 8.14.0 (2016-11-22)
-
+- Fix Milestone dropdown not stay selected for `Upcoming` and `No Milestone` option !7117
 - Backups do not fail anymore when using tar on annex and custom_hooks only. !5814
 - Adds user project membership expired event to clarify why user was removed (Callum Dryden)
 - Trim leading and trailing whitespace on project_path (Linus Thiel)

app/views/shared/issuable/_milestone_dropdown.html.haml

 - project = @target_project || @project
 - extra_class = extra_class || ''
 - show_menu_above = show_menu_above || false
-- selected_text = selected.try(:title)
+- selected_text = selected.try(:title) || params[:milestone_title]
 - dropdown_title = local_assigns.fetch(:dropdown_title, "Filter by milestone")
 - if selected.present?
-  = hidden_field_tag(name, name == :milestone_title ? selected.title : selected.id)
+  = hidden_field_tag(name, name == :milestone_title ? selected_text : selected.id)
 = dropdown_tag(milestone_dropdown_label(selected_text), options: { title: dropdown_title, toggle_class: "js-milestone-select js-filter-submit #{extra_class}", filter: true, dropdown_class: "dropdown-menu-selectable dropdown-menu-milestone",
   placeholder: "Search milestones", footer_content: project.present?, data: { show_no: true, show_menu_above: show_menu_above, show_any: show_any, show_upcoming: show_upcoming, field_name: name, selected: selected.try(:title), project_id: project.try(:id), milestones: milestones_filter_dropdown_path, default_label: "Milestone" } }) do
   - if project

spec/features/issues/filter_by_milestone_spec.rb

@@ -11,6 +11,7 @@ feature 'Issue filtering by Milestone', feature: true do
     visit_issues(project)
     filter_by_milestone(Milestone::None.title)
 
+    expect(page).to have_css('.milestone-filter .dropdown-toggle-text', text: 'No Milestone')
     expect(page).to have_css('.issue', count: 1)
   end
 
@@ -22,6 +23,7 @@ feature 'Issue filtering by Milestone', feature: true do
       visit_issues(project)
       filter_by_milestone(Milestone::Upcoming.title)
 
+      expect(page).to have_css('.milestone-filter .dropdown-toggle-text', text: 'Upcoming')
       expect(page).to have_css('.issue', count: 0)
     end
 
@@ -33,6 +35,7 @@ feature 'Issue filtering by Milestone', feature: true do
       visit_issues(project)
       filter_by_milestone(Milestone::Upcoming.title)
 
+      expect(page).to have_css('.milestone-filter .dropdown-toggle-text', text: 'Upcoming')
       expect(page).to have_css('.issue', count: 1)
     end
 
@@ -44,6 +47,7 @@ feature 'Issue filtering by Milestone', feature: true do
       visit_issues(project)
       filter_by_milestone(Milestone::Upcoming.title)
 
+      expect(page).to have_css('.milestone-filter .dropdown-toggle-text', text: 'Upcoming')
       expect(page).to have_css('.issue', count: 0)
     end
   end
@@ -55,6 +59,7 @@ feature 'Issue filtering by Milestone', feature: true do
     visit_issues(project)
     filter_by_milestone(milestone.title)
 
+    expect(page).to have_css('.milestone-filter .dropdown-toggle-text', text: milestone.title)
     expect(page).to have_css('.issue', count: 1)
   end
 
@@ -70,6 +75,7 @@ feature 'Issue filtering by Milestone', feature: true do
       visit_issues(project)
       filter_by_milestone(milestone.title)
 
+      expect(page).to have_css('.milestone-filter .dropdown-toggle-text', text: milestone.title)
       expect(page).to have_css('.issue', count: 1)
     end
   end