feat: new :tree-sitter-tree command

[nik-rev]

Using % to select entire file and then using :tree-sitter-subtree which opens in a tiny window makes it difficult to inspect the entire tree.

This PR adds a new command, :tree-sitter-tree

This command displays the entire tree sitter tree and updates it live as you type. Additionally, it highlights syntax nodes

Closes #12149

[uncenter]

For now - as the panel doesn't auto update - would it be possible for subsequent :ts-tree invocations to replace the existing (if it still exists) ts-tree buffer instead of creating a new one?

[nik-rev]

For now - as the panel doesn't auto update - would it be possible for subsequent :ts-tree invocations to replace the existing (if it still exists) ts-tree buffer instead of creating a new one?

Ok, I just pushed a commit. it will replace the existing buffer now.

[uncenter]

And is it possible to prevent writing to the syntax tree buffer? Nvim's impl prevents modifying it, and I think especially now that we replace the buffer with a new one we should expect users not to edit it - and enforce that.

[nik-rev]

And is it possible to prevent writing to the syntax tree buffer? Nvim's impl prevents modifying it, and I think especially now that we replace the buffer with a new one we should expect users not to edit it - and enforce that.

It's not possible to make a file unwritable from what I can tell (readonly will still allow editing, but not saving).

See also this comment by @the-mikedavis : #7128 (comment)

[nik-rev]

And is it possible to prevent writing to the syntax tree buffer? Nvim's impl prevents modifying it, and I think especially now that we replace the buffer with a new one we should expect users not to edit it - and enforce that.

I've actually ended up implementing this. Buffers can now be non-modifiable, which prevents running any commands like going into insert mode, delete, paste etc.