Scope improvements

[FichteFoll]

Adding a custom embed_scope allows to exclude vue embeds from linting, for example, using source.js - source.js.embedded.vue, which would otherwise generate a lot of "xy not defined" errors.

For even more granularity, I added a meta.template.vue scope for mustache expressions.

[skyronic]

Could you give me some steps to test and verify this change works?

[FichteFoll]

I could provide a syntax test file that at least asserts my changes. Unless you are asking about the linter integration?

[skyronic]

I don't think we need an assertation test. Just would like a bit more information what kind of linting setup you tested it with, so I can reproduce the issue.

Some screenshots of before/after would also be good if possible. This is more to just document this for future purposes and changelogs, etc.

[FichteFoll]

SublimeLinter-eslint with default settings:

SublimeLinter-eslint with

            "selector": "source.js - source.js.embedded.vue"

and my PR:

I was able to construct a selector that would exclude vue-embedded js code from linting, but it wasn't as simple. I don't have it anymore, but it was something along the lines of source.js - (text.html.vue source.js - source.js.embedded.html).

[skyronic]

Thank you for taking the time to put the information across. It's pretty clear why we need this change.

The code looks good and I'm going to merge it in after doing a couple of tests myself. Will this have any impact on users using the eslint plugin for vue?

[FichteFoll]

No, it will only affect how Sublime Text scopes text and allows for better scope selection by linters. Currently, users still need to change their linter setting manually to profit from the change. I'm not sure if changing the default selector for SublimeLinter-eslint would be the right thing to do here, although I can hardly see a valid use case for linting these embeds when you have checks like unused-var enabled, which is the default iirc.

cc @braver

[skyronic]

This looks ok. I'll continue testing with it for a few days, if I have any issues I might revert it, hope that's ok.