Debatable rendering of external link (and missing space)

[strk]

A link to an issue on a foreign code hosting is rendered as just #6 and the space before it is removed. See https://try.gitea.io/strk/postgis/pulls/1

The source code of that PR description is:

Mirror of https://git.osgeo.org/gogs/postgis/postgis/pulls/6

It is rendered as:

Mirror of#6

Reported gitea version at the time of writing this report: 27798c3

[ethantkoenig]

It seems there are tests in markdown_test.go that explicitly check for this.

I agree that we should only render issue links for internal links, instead of assuming that any URL ending in a number points to some sort of issue, and am happy to make the fix. I just want to make sure there is consensus before actually making changes.