show in assignable user when he/she is not member of that project
When moving an issue to another project that author of issue is not member of that, in edit form 'author' shown as an assignable user.
This patch can fix the error.
Index: app/models/issue.rb <+>UTF-8 =================================================================== diff --git a/app/models/issue.rb b/app/models/issue.rb --- a/app/models/issue.rb (revision ec859e41d689ee3432113c3bd74ba48d060c9a2f) +++ b/app/models/issue.rb (date 1640777418920) @@ -975,7 +975,7 @@ return  if project.nil? users = project.assignable_users(tracker).to_a - users << author if author && author.active? + users << author if author && author.active? && project.users.include?(author) if assigned_to_id_was.present? && assignee = Principal.find_by_id(assigned_to_id_was) users << assignee end