Index: app/models/changeset.rb
===================================================================
--- app/models/changeset.rb     (revision 3033)
+++ app/models/changeset.rb     (working copy)
@@ -112,6 +112,11 @@
           journal = issue.init_journal(user || User.anonymous, ll(Setting.default_language, :text_status_changed_by_changeset, csettext))
           issue.status = fix_status
           issue.done_ratio = done_ratio if done_ratio
+         reassign_to = nil
+         issue.assignable_users.each do |assignuser|
+               reassign_to = assignuser if assignuser.id == issue.author_id
+         end
+         issue.assigned_to = reassign_to
           Redmine::Hook.call_hook(:model_changeset_scan_commit_for_issue_ids_pre_issue_update,
                                   { :changeset => self, :issue => issue })
           issue.save