gogs: Pull request patch conflict detection isn't working with Git localization

• Gogs version (or commit ref): Gogs Version: 0.10.8.0307 (installed via Packager.io)
• Git version: 2.1.4
• Operating system: Debian Jessie
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gogs.io:
  • Yes (provide example URL)
  • No
  • Not relevant
• Log gist (usually found in log/gogs.log):

Description

When creating pull-requests, they are checked ONCE if a merge would work. This makes some trouble when having concurrent pull-requests.

When a second pull-request gets merged before the first one, and the second one contains changes which are incompatible with the first one, we only see a 500 error page, while the logs are saying “merge conflict”, but this is not visible inside the PR-page nor the recieved 500 error page.

It would be nice if this can be re-evaluated when clicking on a “reanalyse/recheck”-button, or even when opening the PR-page (maybe in addition being configurable). Or maybe it is possible to schedule this as some cron-task which re-validates the merge-ability of the open pull-requests?!

Additional Note: maybe the issue-template should include the way how GOGS was installed (via source or binary from packager.io and such methods)