Accept "plaintext" immediately following triple backticks
Gitlab seems to sometimes add a plaintext
tag right after the opening triple backticks, even if you didn't type it in
yourself. The bot doesn't expect the plaintext
tag and thinks the version info isn't in a code block.
This change teaches the bot that properly-formatted version info can start with ```plaintext
, and prevents the bot from mangling the version info in that case.
Haven't tried on real issues, obviously, but the unit tests pass and I added a new test for the ```plaintext
form.
Reference: kicad/code/kicad#15686 (closed)
Edited by Graham Keeth