Proposal: Adding organization members as collaborators on org-owned repos

[maxtruxa]

• Gitea version (or commit ref): v1.5.0-rc1
• Git version: 2.14.2
• Operating system: Windows
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
  • Not relevant
• Log gist: N/A

Description

Trying to add a user which is part of the organization owning a repository as collaborator fails with the message "The user is an organization member who cannot be added as a collaborator.". Would it be possible to allow this (GitHub for example does)? We want to explicitly grant write access to single users without creating new teams.
Code in question is here.

Screenshots