Add release highlights for 24.03 (#39)

* Add release highlights for 24.03

* Copy edit

content/news/2024-03-30-release-24.03-highlights.md

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+title = "Release 24.03 Highlights"
+date = 2024-03-30T00:00:00Z
+type = "post"
+description = "Highlights of the 24.03 release."
+in_search_index = true
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+
+The Helix 24.03 release has arrived! First, a very big _thank you_ to everyone
+who made this release possible. This release saw changes from 125 contributors.
+
+New to Helix?
+Helix is a modal text editor with built-in support for multiple selections,
+Language Server Protocol (LSP), tree-sitter, and experimental support for Debug
+Adapter Protocol (DAP).
+
+Let's check out this release's highlights.
+
+## Amp-like jumping
+
+{{ asciinema(id="amp-jump", width="94", height="25") }}
+
+Jumping features are popular in the (Neo)Vim plugin space and there are even
+plugins to add the same functionality to other tools like browsers. They allow
+you to move your selection efficiently across even large parts of the view,
+like you could by clicking with a mouse, but by entering "labels" instead.
+24.03 introduces jumping commands inspired by the [Amp editor]'s [jump mode].
+Press `gw` to add the jump labels and then enter one of the labels to jump to
+the word under that label. Using `gw` in select mode (`v`) extends the
+selection.
+
+## Block comments
+
+In the past, Helix has only been able to toggle line comments like `//` and `#`
+and languages like OCaml have been left with workarounds like a "line" comment
+token of `(*`. In 24.03 Helix can now toggle block comments as well. Use `C-c`
+or `<space>c` to smartly add or remove line or block comments around the current
+selection based on the language's comment token configuration, `<space>c` to
+toggle block comments around the current selection, or `<space><A-c>` to toggle
+only line comments on the current line.
+
+## Improvements to tree-sitter injections
+
+Helix uses [`tree-sitter`] incremental parsing for syntax highlighting,
+textobjects, indentation and some motions and commands. 24.03 improves how we
+handle _[injections]_ - a powerful tree-sitter feature for parsing documents
+with multiple languages. For example you might have JavaScript, CSS or other
+languages within a `<script>` or `<style>` tag in HTML. The HTML parser doesn't
+need to know how to parse all of these languages. Instead it can _inject_
+JavaScript or CSS parsers to handle the `<script>` or `<style>` tag contents.
+
+{{ asciinema(id="ts-subtree-and-motions-injection", width="94", height="25") }}
+
+One of these improvements is to the `:tree-sitter-subtree` command that
+displays an S-expression of the syntax tree under the cursor. 24.03 shows the
+injection layer under the selection instead of only the root layer. For example
+in this asciicast we now show the syntax tree for the JavaScript parts of the
+document while in the past we only showed the HTML part of the tree.
+
+The other big improvement is to the tree-sitter motions. `A-o` (alt + o)
+expands the selection to the parent node of the syntax tree node covered by the
+current selection. `A-i` shrinks to the child node and `A-n` and `A-p` go to
+the <em>n</em>ext and <em>p</em>revious nodes, respectively. Previously these
+commands only worked on the root layer (for example HTML in the asciicast) but
+they now find the injection layer that contains the selection and move along
+that layer's syntax tree. Internally we organize injection layers into a
+tree-like structure so that these motions can switch layers when needed.
+
+Stay tuned for future changes that improve injections, like finding textobjects
+within injected content.
+
+## Internal improvements
+
+24.03 also saw major internal improvements. The first comes from a new "event
+system" - a system built around Tokio channels and tasks that allows different
+parts of the Helix codebase to communicate with one another. The event system
+also adds generic ways to debounce and run tasks in background threads so we
+can prevent locking up the UI. Some parts of the code base have already been
+migrated to the event system like LSP completion and signature-help. In
+24.03 you'll notice that LSP completion doesn't automatically pop up after just
+navigating around in insert mode, for example with arrow keys. It's now hooked
+into document changes instead, so it can smartly pop up when you start changing
+a document rather than every time the editor goes idle.
+
+The other major improvement to be excited for is the general replacement of the
+`regex` crate with [`regex-cursor`], a streaming regex implementation
+compatible with [`ropey`], the rope crate we use to represent all documents.
+`regex-cursor` is capable of running on _discontiguous strings_ - input that
+may not be collocated in memory. In a rope, different parts of the document
+might be stored separately internally. To use the `regex` API we needed to
+convert slices of the document to a regular Rust `String`, duplicating the
+memory footprint of that slice of the document. `regex-cursor` operates on the
+chunks of the rope instead, which greatly improves efficiency.
+
+## Wrapping up
+
+As always, this is just the highlights from the 24.03 release. Check out the
+full [changelog] for the details.
+
+Come chat about usage and development questions in the [Matrix space][matrix]
+and follow along with Helix's development in the [GitHub repository][helix-git].
+
+[Amp editor]: https://github.com/jmacdonald/amp
+[jump mode]: https://amp.rs/docs/usage/#jump-mode
+[`tree-sitter`]: https://github.com/tree-sitter/tree-sitter
+[injections]: https://tree-sitter.github.io/tree-sitter/syntax-highlighting#language-injection
+[`regex-cursor`]: https://github.com/pascalkuthe/regex-cursor
+[`ropey`]: https://github.com/cessen/ropey
+[changelog]: https://github.com/helix-editor/helix/blob/master/CHANGELOG.md#2404-2024-03-30
+[helix-git]: https://github.com/helix-editor/helix/
+[matrix]: https://matrix.to/#/#helix-community:matrix.org