When attempting to store Lua code with fatal errors, in page head scribunto-lua-error-location system message appears.
Currently this is just <p> in regular black.
I would like to see it wrapped in <div class="error">, appearing in red colour and stronger letters, and detectable.
Please provide more detail as to where exactly the message appears and how to reproduce it. The message cited is generically used for every exception thrown, many of which are already wrapped with <strong class="error">.
“When attempting to store” – well, create Lua code page with fatal error. E.g. a single line
local invalid = ?
Drop this on a new Module: page and try to save or “publish”.
I thought this had been fixed long ago. After some digging, I find that it was: rMWa02a7ff8eab9: EditPage: Show EditFilterMergedContent hook errors in an errorbox fixed it in 2016. But then T149473: Edit warnings have escaped HTML just reverted it instead of actually fixing the problem, which at a glance seems like could have been done by just changing the getHtml() call in formatStatusError() to getWikiText().
Change 406309 had a related patch set uploaded (by Anomie; owner: Anomie):
[mediawiki/core@master] Revert and fix "Revert "EditPage: Show EditFilterMergedContent hook errors in an errorbox""
Change 406309 merged by jenkins-bot:
[mediawiki/core@master] Revert and fix "Revert "EditPage: Show EditFilterMergedContent hook errors in an errorbox""