Merge branch 'wipMergeSpacing' into 'master'

No space required after WIP identifier

Fixes #2426 

Currently, the WIP: (or any other variation) prefix of a merge request title must include a trailing space for it to be recognized as a work in progress and prevent merging. 
To resolve this, I added an or pattern to the regexp to look for any one of the three possible delimiters ':', ']', or ' '. This way the trailing space isn't required but it still won't mark any titles beginning with wip as work in progress (e.g. "Wipwap").

See merge request !1876

CHANGELOG

@@ -180,6 +180,7 @@ v 8.3.0
   - Handle and report SSL errors in Web hook test (Stan Hu)
   - Bump Redis requirement to 2.8 for Sidekiq 4 (Stan Hu)
   - Fix: Assignee selector is empty when 'Unassigned' is selected (Jose Corcuera)
+  - WIP identifier on merge requests no longer requires trailing space
   - Add rake tasks for git repository maintainance (Zeger-Jan van de Weg)
   - Fix 500 error when update group member permission
   - Fix: As an admin, cannot add oneself as a member to a group/project

app/models/merge_request.rb

@@ -258,7 +258,7 @@ class MergeRequest < ActiveRecord::Base
   end
 
   def work_in_progress?
-    !!(title =~ /\A\[?WIP\]?:? /i)
+    !!(title =~ /\A\[?WIP(\]|:| )/i)
   end
 
   def mergeable?

spec/models/merge_request_spec.rb

@@ -188,6 +188,11 @@ describe MergeRequest, models: true do
       expect(subject).to be_work_in_progress
     end
 
+    it "detects the '[WIP]' prefix" do
+      subject.title = "[WIP]#{subject.title}"
+      expect(subject).to be_work_in_progress
+    end
+
     it "doesn't detect WIP for words starting with WIP" do
       subject.title = "Wipwap #{subject.title}"
       expect(subject).not_to be_work_in_progress