* helix-view/view: impl method to remove document from jumps
* helix-view/editor: impl close_document
* helix-view/editor: remove close_buffer argument from `close`
According to archseer, this was never implemented or used properly. Now
that we have a proper "buffer close" function, we can get rid of this.
* helix-term/commands: implement buffer-close (bc, bclose)
This behaves the same as Kakoune's `delete-buffer` / `db` command:
* With 3 files opened by the user with `:o ab`, `:o cd`, and `:o ef`:
* `buffer-close` once closes `ef` and switches to `cd`
* `buffer-close` again closes `cd` and switches to `ab`
* `buffer-close` again closes `ab` and switches to a scratch buffer
* With 3 files opened from the command line with `hx -- ab cd ef`:
* `buffer-close` once closes `ab` and switches to `cd`
* `buffer-close` again closes `cd` and switches to `ef`
* `buffer-close` again closes `ef` and switches to a scratch buffer
* With 1 file opened (`ab`):
* `buffer-close` once closes `ab` and switches to a scratch buffer
* `buffer-close` again closes the scratch buffer and switches to a new
scratch buffer
* helix-term/commands: implement buffer-close! (bclose!, bc!)
Namely, if you have a document open in multiple splits, all the splits
will be closed at the same time, leaving only splits without that
document focused (or a scratch buffer if they were all focused on that
buffer).
* helix-view/tree: reset focus if Tree is empty
* Launch with defaults upon invalid config/theme
* Startup message if there is a problematic config
* Statusline error if trying to switch to an invalid theme
* Use serde `deny_unknown_fields` for config
* Implement `hx --tutor` and `:tutor` to load `tutor.txt`
* Document `hx --tutor` and `:tutor`
* Change `Document::set_path` to take an `Option`
* `Document::set_path` accepts an `Option<&Path>` instead of `&Path`.
* Remove `Editor::open_tutor` and make tutor-open functionality use
`Editor::open` and `Document::set_path`.
* Use `PathBuf::join`
Co-authored-by: Ivan Tham <pickfire@riseup.net>
* Add comments explaining unsetting tutor path
Co-authored-by: Ivan Tham <pickfire@riseup.net>
* improve idle completion trigger
* add completion-trigger-len to book
* rename semantics_completion to language_server_completion and optimize idle completion trigger
