Update Visible Set When Invalidated

[thecoolwinter]

Description

Adds a method to update the visible set and adds a call to that method when invalidating the entire document to ensure any newly visible text is correctly re-highlighted.

Related Issues

• Closes #190

Checklist

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

Screenshots

https://github.com/CodeEditApp/CodeEditTextView/assets/35942988/05347932-ed0b-4a72-ace4-551300e5e7aa