tests: Screen:expect: support "{MATCH:…}"

[blueyed]

Initially done for #10978 (to match varying number of cols/rows) - but likely not useful there anymore.

Since I've missed this before it might be good to have it.
Though I cannot remember a use case where this could be used directly already. Hints?

[bfredl]

I guess it could be used where IGNORE is currently used to be more specific, like the intro screen tests. But it might not be a high-priority issue.

[bfredl]

Also, if we do this, we should merge IGNORE into it, as IGNORE can just be expressed as match-everything regex .*.

[blueyed]

A good use case:

neovim/test/functional/terminal/tui_spec.lua

Line 542 in 70e4429

{8:paste: Error executing lua: vim.lua:197: Vim:E21: }|

(the line number of the error message / location).

[justinmk]

@blueyed I think we're all in favor of this, but maybe IGNORE should be replaced with MATCH:.* everywhere. That simplifies the docs at least . And line 277 needs an update:

--              "{MATCH:x}|" lines are matched against Lua pattern x.

[blueyed]

@justinmk
Thanks for picking this up / finishing it.

btw: there's a new Github repo setting to delete branches automatically - I think it's good to enable it.