9a01062ae2
When mentioning a user, the markup post-processor did not handle the case where the mentioned user did not exist well: it tried to skip to the next node, which in turn, ended up skipping the rest of the line. To fix this, lets skip just the mentioned, but non-existing user, and continue processing the current node from there. Fixes #3535. Signed-off-by: Gergely Nagy <forgejo@gergo.csillger.hu>