HTML Tree-sitter not being picked

[Aerijo]

Prerequisites

• [X] Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: https://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: https://flight-manual.atom.io/hacking-atom/sections/debugging/
  • Checked the FAQs on the message board for common solutions: https://discuss.atom.io/c/faq
  • Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aatom
  • Checked that there is not already an Atom package that provides the described functionality: https://atom.io/packages

Description

When opening an HTML file with existing content, the TextMate grammar will have a higher score than the Tree-sitter grammar.

Looking at how the score is calculated, both get +4 for path match (file extension, etc.). But then, the TextMate grammar has a firstLineRegex, which matches and gives it a +0.5 boost. The Tree-sitter grammar does not have this, and only gets the +0.1 boost from being Tree-sitter. Neither gain any more points, so TextMate wins.

Steps to Reproduce

1. Open an HTML file. E.g., https://github.com/atom/atom/blob/master/static/index.html
2. Check the grammar being used.

Expected behavior:

Use Tree-sitter

Actual behavior:

Use TextMate

Reproduces how often:

100%

Versions

Atom    : 1.40.1
Electron: 3.1.10
Chrome  : 66.0.3359.181
Node    : 10.2.0

[stale[bot]]

Thanks for your contribution!

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[aminya]

Unstale!