Smarter Default Highlight Provider Management

[thecoolwinter]

Description

Updates the highlight provider parameter to correctly reflect its documentation, and use a smarter method for keeping around the default highlighter. This fixes an issue where the default highlight provider was re-initialized on every view update (keyboard navigation, keystrokes, etc.).

Now, highlight providers have two states: nil or Array. If CESE sees a nil argument, it creates and keeps around a TreeSitterClient like the documentation says. This client is kept as a variable on the view's coordinator so it isn't re-initialized between view updates.

This also allows highlighting to be disabled by passing an empty array for the highlight providers parameter, causing CESE to not make any default providers.

Related Issues

• closes 🐞 Flickering on cursor move and text editing #293
• closes 🐞 Broken example #298

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

Screenshots

N/A