Allow to handle autoclosed characters differently (#8666)

Adds the `always_treat_brackets_as_autoclosed` setting to control how
the autoclosed characters are handled.

The setting is off by default, meaning the behaviour stays the same
(following how VSCode handles autoclosed characters).
When set to `true`, the autoclosed characters are always skipped over
and auto-removed no matter how they were inserted (following how Sublime
Text/Xcode handle this).


https://github.com/zed-industries/zed/assets/471335/304cd04a-59fe-450f-9c65-cc31b781b0db


https://github.com/zed-industries/zed/assets/471335/0f5b09c2-260f-48d4-8528-23f122dee45f

Release Notes:

- Added the setting `always_treat_brackets_as_autoclosed` (default:
`false`) to always treat brackets as "auto-closed" brackets, i.e.
deleting the pair when deleting start/end, etc.
([#7146](https://github.com/zed-industries/zed/issues/7146)).

---------

Co-authored-by: Thorsten Ball <mrnugget@gmail.com>

docs/src/configuring_zed.md

@@ -380,6 +380,26 @@ To override settings for a language, add an entry for that language server's nam
 
 `boolean` values
 
+## Always Treat Brackets As Autoclosed
+
+- Description: Controls how the editor handles the autoclosed characters.
+- Setting: `always_treat_brackets_as_autoclosed`
+- Default: `false`
+
+**Options**
+
+`boolean` values
+
+**Example**
+
+If the setting is set to `true`:
+
+1. Enter in the editor: `)))`
+2. Move the cursor to the start: `^)))`
+3. Enter again: `)))`
+
+The result is still `)))` and not `))))))`, which is what it would be by default.
+
 ## File Types
 
 - Setting: `file_types`
@@ -573,6 +593,8 @@ The following settings can be overridden for each specific language:
 - `show_whitespaces`
 - `soft_wrap`
 - `tab_size`
+- `use_autoclose`
+- `always_treat_brackets_as_autoclosed`
 
 These values take in the same options as the root-level settings with the same name.