Make rebase from quick actions async

Also move rebase functionality into `MergeRequests::UpdateService` to
ensure merges/rebases are handled in the same location.

app/services/merge_requests/update_service.rb

@@ -127,14 +127,22 @@ module MergeRequests
     def handle_quick_actions(merge_request)
       super
 
-      # Ignore /merge if /rebase is used to avoid an unexpected race
-      params.delete(:merge) if params[:rebase] && params[:merge]
-      # Rebase is handled in MergeRequestActions to provide user feedback
-      params.delete(:rebase)
+      # Ensure this parameter gets used as an attribute
+      rebase = params.delete(:rebase)
+
+      if rebase
+        rebase_from_quick_action(merge_request)
+        # Ignore /merge if /rebase is used to avoid an unexpected race
+        params.delete(:merge)
+      end
 
       merge_from_quick_action(merge_request) if params[:merge]
     end
 
+    def rebase_from_quick_action(merge_request)
+      merge_request.rebase_async(current_user.id)
+    end
+
     def merge_from_quick_action(merge_request)
       last_diff_sha = params.delete(:merge)
 

lib/gitlab/quick_actions/merge_request_actions.rb

@@ -59,17 +59,9 @@ module Gitlab
           # This will be used to avoid simultaneous /merge and /rebase actions
           @updates[:rebase] = true
 
-          result = MergeRequests::RebaseService.new(quick_action_target.project, current_user)
-                      .execute(quick_action_target)
-
           branch = quick_action_target.source_branch
 
-          @execution_message[:rebase] =
-            if result[:status] == :success
-              _('Scheduled a rebase of branch %{branch}.')
-            else
-              _('Failed to schedule a rebase of %{branch}.')
-            end % { branch: branch }
+          @execution_message[:rebase] = _('Scheduled a rebase of branch %{branch}.') % { branch: branch }
         end
 
         desc 'Toggle the Draft status'

locale/gitlab.pot

@@ -11880,9 +11880,6 @@ msgstr ""
 msgid "Failed to save preferences."
 msgstr ""
 
-msgid "Failed to schedule a rebase of %{branch}."
-msgstr ""
-
 msgid "Failed to set due date because the date format is invalid."
 msgstr ""