Non-English characters not displayed in Markdown links on Linux

[jsparkdev]

Check for existing issues

• Completed

Describe the bug / provide steps to reproduce it

As shown in the following image, characters such as Korean, Japanese, Chinese, and Arabic are not displayed correctly in the Linux Markdown link.

Environment

Zed: v0.150.3 (Preview)
OS: Linux Mint 22
Memory: 2451MiB / 31988MiB
Architecture: x86_64
GPU: AMD ATI Radeon RX 470/480/570/570X/580/580X/590

[jsparkdev]

Oh, I see! Is it okay to provide a string like this?

The three strings below are Korean, Chinese, and Japanese, respectively.

[안녕하세요](https://zed.dev)
[你好](https://zed.dev)
[こんにちは](https://zed.dev)

[notpeter]

This works correctly on MacOS, but I am able to reproduce on Linux (Ubuntu 24):

• Works in normal code.
• Works in the markdown preview.
• Broken inside the [brackets] of a link in markdown.

Temporary workaround:

  "experimental.theme_overrides": {
    "syntax": {
      "link_text": {
        "font_style": "normal"
      }
    }
  },

[jsparkdev]

@notpeter This method works! thank you

[mgsloan]

Looks like the best place to fix this would be in the cosmic-text crate - see pop-os/cosmic-text#114

Could probably be addressed on the Zed side here, but would be much cleaner to do this via augmenting cosmic-text's existing fallback logic. Specifically see use of FontFallbackIter in cosmic-text here