Check modified lines only, instead of the whole file

[binarymonkey84]

I had thought I'd read somewhere that the default behaviour for Theme Check in this action context was to only check modified lines, but it seems the entire file is checked when it contains any modifications.

Since we work with customising third party themes, when it comes to pull requests, we're only really concerned about code we are introducing to the theme, and not issues with code that isn't "ours".

Can we configure the action to only check modified lines instead of the entire file?

[lukeh-shopify]

👋 Hey @binarymonkey84, thanks for reporting this. I've checked with the team and you are correct that checks are run on the entire modified file, and not simply the changed lines. This was always the expected behaviour and we don't have any immediate plans to prioritize this feature. I'll add an open for contributions label to indicate this is something that can be worked on by the open source community if they wish.