Move tree-sitter and tree_sitter_languages to optional extras (#3398)

* Move tree-sitter and tree_sitter_languages to optional extras

* Update docs and GitHub action for moving syntax to extras

* Updating, remake lockfile

* Update snapshots from textual-dev change

* Improve warning when a language is set but tree-sitter not available

* Update CHANGELOG

* Add note on syntax extras

* Update lock

.github/workflows/pythonpackage.yml

@@ -41,7 +41,7 @@ jobs:
           path: .venv
           key: venv-${{ runner.os }}-${{ matrix.python-version }}-${{ hashFiles('**/poetry.lock') }}
       - name: Install dependencies
-        run: poetry install
+        run: poetry install --extras syntax
         if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
 #      - name: Typecheck with mypy
 #        run: |

CHANGELOG.md

@@ -27,6 +27,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 
+- Breaking change: tree-sitter and tree-sitter-languages dependencies moved to `syntax` extra https://github.com/Textualize/textual/pull/3398
 - `Pilot.click`/`Pilot.hover` now raises `OutOfBounds` when clicking outside visible screen https://github.com/Textualize/textual/pull/3360
 - `Pilot.click`/`Pilot.hover` now return a Boolean indicating whether the click/hover landed on the widget that matches the selector https://github.com/Textualize/textual/pull/3360
 - Added a delay to when the `No Matches` message appears in the command palette, thus removing a flicker https://github.com/Textualize/textual/pull/3399

docs/widgets/text_area.md

@@ -12,6 +12,25 @@ Supports syntax highlighting for a selection of languages.
 
 ## Guide
 
+### Syntax highlighting dependencies
+
+To enable syntax highlighting, you'll need to install the `syntax` extra dependencies:
+
+=== "pip"
+
+    ```
+    pip install "textual[syntax]"
+    ```
+
+=== "poetry"
+
+    ```
+    poetry add "textual[syntax]"
+    ```
+
+This will install `tree-sitter` and `tree-sitter-languages`.
+These packages are distributed as binary wheels, so it may limit your applications ability to run in environments where these wheels are not supported.
+
 ### Loading text
 
 In this example we load some initial text into the `TextArea`, and set the language to `"python"` to enable syntax highlighting.