Second take on https://github.com/zed-industries/zed/pull/37765.
This PR adds support for styling elements (**b**, **strong**, **em**,
**i**, **ins**, **del**), but also allow you to show the styling text
inline with the current text.
This is done by appending all the up-following text into one text chunk
and merge the highlights from both of them into the already existing
chunk. If there does not exist a text chunk, we will create one and the
next iteration we will use that one to store all the information on.
**Before**
<img width="483" height="692" alt="Screenshot 2025-11-06 at 22 08 09"
src="https://github.com/user-attachments/assets/6158fd3b-066c-4abe-9f8e-bcafae85392e"
/>
**After**
<img width="868" height="300" alt="Screenshot 2025-11-06 at 22 08 21"
src="https://github.com/user-attachments/assets/4d5a7a33-d31c-4514-91c8-2b2a2ff43e0e"
/>
**Code example**
```html
<p>some text <b>bold text</b></p>
<p>some text <strong>strong text</strong></p>
<p>some text <i>italic text</i></p>
<p>some text <em>emphasized text</em></p>
<p>some text <del>delete text</del></p>
<p>some text <ins>insert text</ins></p>
<p>Some text <strong>strong text</strong> more text <b>bold text</b> more text <i>italic text</i> more text <em>emphasized text</em> more text <del>deleted text</del> more text <ins>inserted text</ins></p>
<p><a href="https://example.com">Link Text</a></p>
<p style="text-decoration: underline;">text styled from style attribute</p>
```
cc @bennetbo
**TODO**
- [x] add tests for styling nested text that should result in one merge
Release Notes:
- Markdown Preview: Added support for `HTML` styling elements
---------
Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>
9591790d8d