Merge branch '517768-case-insensitive-labels-autocomplete' into 'master'

Make multi-word label matching case-insensitive

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/180823



Merged-by: Heinrich Lee Yu <heinrich@gitlab.com>
Approved-by: Lindsey Shelton <lshelton@gitlab.com>
Approved-by: Tomas Bulva <tbulva@gitlab.com>
Approved-by: Costel Maxim <cmaxim@gitlab.com>

app/assets/javascripts/gfm_auto_complete.js

@@ -700,8 +700,8 @@ class GfmAutoComplete {
               // Do not match if there are two consecutive `~` characters (strikethrough) before the cursor
               return null;
             }
-            const lastCandidate = subtext.split(flag).pop();
-            if (labels.find((label) => label.title.startsWith(lastCandidate))) {
+            const lastCandidate = subtext.split(flag).pop().toLowerCase();
+            if (labels.find((label) => label.title.toLowerCase().startsWith(lastCandidate))) {
               return lastCandidate;
             }
           }

spec/features/issues/gfm_autocomplete_spec.rb

@@ -300,7 +300,7 @@
       end
 
       it 'allows spaces when autocompleting multi-word labels' do
-        fill_in 'Comment', with: '~Accepting merge'
+        fill_in 'Comment', with: '~accepting merge'
 
         wait_for_requests