araya 6880af31f6 fonts: Do not fall back to non-Japanese fonts for Han in Japanese language documents (#39608) ...

## Motivations

This PR improves fallback font algorithm for Japanese documents on macos
and Linux.

For Japanese documents, we generally use a same font for
Hiragana/Katakana/Kanji(Han).
Since their is a fallback algorithm to render serif fonts for
`Script::Han`in current implementation, it gives unnatural reading
experience for Japanese users.

## Changes
To achieve above, 
- added `lang` field to `FallbackFontSelectionOptions` struct
- pass `_x_lang` from text_run in layout component

## Screenshots
rendering https://ja.wikipedia.org/wiki/Servo

<table>
<thead>
<tr>
<th>before fixed</th>
<th>after fixed</th>

</tr>
</thead>
<tbody>
<tr>
<td>
<!-- before fixed -->
<img width="545" height="168" alt="CleanShot 2025-10-01 at 23 08 24"
src="https://github.com/user-attachments/assets/9ad7ccb0-729a-49ad-b8ce-88b1d78a2705"
/>



</td>
<td>
<!-- after fixed -->

<img width="474" height="139" alt="CleanShot 2025-10-01 at 23 07 16"
src="https://github.com/user-attachments/assets/010e8052-5a10-48e1-8367-ff29a5632d0f"
/>


</td>

</tr>
</tbody>
</table>

---------

Signed-off-by: araya <araya@araya.dev>

2025-10-11 09:07:14 +00:00

..

inline

fonts: Do not fall back to non-Japanese fonts for Han in Japanese language documents (#39608)

2025-10-11 09:07:14 +00:00

construct.rs

Allow WebViews and fonts to have a RenderingGroupId. (#39140)

2025-09-29 10:01:56 +00:00

float.rs

layout: Unify logic for laying out replaced and non-replaced in a BFC (#37864)

2025-07-04 17:47:40 +00:00

mod.rs

layout: Remove some unneeded type annotations (#39690)

2025-10-06 22:09:57 +00:00

root.rs

script: Chain up keyboard scrolling to parent <iframe>s (#39469)

2025-09-25 11:16:41 +00:00