`buffer_font_fallbacks` doesn't seem to work under Linux

### Description

add `buffer_font_fallbacks` in settings doesn't look like doing anything.

```json
{
  "telemetry": {
    "metrics": false
  },
  "vim_mode": true,
  "ui_font_size": 16,
  "buffer_font_size": 16,
  "buffer_font_family": "FantasqueSansM Nerd Font",
  "buffer_font_fallbacks": ["Source Han Sans SC"],
  "buffer_line_height": "standard",
  "theme": {
    "mode": "system",
    "light": "One Light",
    "dark": "Dracula"
  },
  "experimental.theme_overrides": {
    "background": "#282a36ff",
    "title_bar.background": "#141119ff",
    "title_bar.inactive_background": "#1c1d26ff",
    "status_bar.background": "#141119ff"
  }
}
```
`buffer_font_fallbacks` doesn't work. Additionally during typing the auto-completed font name list seems incomplete, but even the fonts that do show up in the auto-complete don't work."


### Environment

Zed: v0.149.5 (Zed)
OS: Linux Wayland arch unknown
Memory: 30.7 GiB
Architecture: x86_64
GPU: NVIDIA GeForce RTX 3060 || NVIDIA || 560.35.03

### If applicable, add mockups / screenshots to help explain present your vision of the feature

![image](https://github.com/user-attachments/assets/65d1c2b7-30fc-4cde-8913-9aa0b6e8a96d)

The text for the text **test** is correct, but for **测试** it is the same as not specifying fallback font.

it should display like this:
![output](https://github.com/user-attachments/assets/f197aa84-e187-42a7-ae8d-0e7c6126d130)
this is produced with:

`pango-view --markup --text='<span font="Source Han Sans SC 24">测试 </span><span font="FantasqueSansM Nerd Font 24">test</span>' --output=output.png` 

### If applicable, attach your Zed.log file to this issue.

<details><summary>Zed.log</summary><pre>

2024-09-02T10:42:57.304982429+08:00 [INFO] open paths ["/home/adv_zxy/asdf.txt"]
2024-09-02T10:43:36.295301368+08:00 [ERROR] oneshot canceled
2024-09-02T10:43:43.148347631+08:00 [INFO] ========== starting zed ==========
2024-09-02T10:43:43.19888085+08:00 [INFO] perform;
2024-09-02T10:43:43.198975189+08:00 [INFO] authenticate;
2024-09-02T10:43:43.199059248+08:00 [INFO] Opening main db
2024-09-02T10:43:43.199125203+08:00 [INFO] read_command;
2024-09-02T10:43:43.199621544+08:00 [INFO] new;
2024-09-02T10:43:43.199700664+08:00 [INFO] socket reader;
2024-09-02T10:43:43.200252289+08:00 [INFO] keep_updated;
2024-09-02T10:43:43.201074077+08:00 [INFO] Using git binary path: None
2024-09-02T10:43:43.230376531+08:00 [INFO] initializing context server client
2024-09-02T10:43:43.230483223+08:00 [INFO] Registering built-in prompt template: content_prompt
2024-09-02T10:43:43.230720112+08:00 [INFO] Registering built-in prompt template: edit_workflow
2024-09-02T10:43:43.231023116+08:00 [INFO] Registering built-in prompt template: step_resolution
2024-09-02T10:43:43.231442832+08:00 [INFO] Registering built-in prompt template: terminal_assistant_prompt
2024-09-02T10:43:43.231718023+08:00 [INFO] No prompt template overrides directory found at /home/adv_zxy/.local/share/zed/prompt_overrides. Using built-in prompts.
2024-09-02T10:43:43.232192362+08:00 [INFO] extensions updated. loading 2, reloading 0, unloading 0
2024-09-02T10:43:43.235768078+08:00 [INFO] performance metrics display disabled
2024-09-02T10:43:43.235852729+08:00 [INFO] activate is not implemented on Linux, ignoring the call
2024-09-02T10:43:43.237242733+08:00 [INFO] perform;
2024-09-02T10:43:43.237313858+08:00 [INFO] authenticate;
2024-09-02T10:43:43.237381636+08:00 [INFO] read_command;
2024-09-02T10:43:43.237886754+08:00 [INFO] socket reader;
2024-09-02T10:43:43.240268397+08:00 [ERROR] DBus error service error org.freedesktop.zbus.Error: The name is not activatable
2024-09-02T10:43:43.240426267+08:00 [INFO] Opening main db
2024-09-02T10:43:43.243447833+08:00 [INFO] set environment variables from shell:/usr/bin/fish, path:/home/adv_zxy/.local/share/gem/ruby/3.0.0/bin:/home/adv_zxy/rainbow/rainbow/web/node_modules/@tencent/tnpm/bin:/home/adv_zxy/.local/bin:/home/adv_zxy/bin:/home/adv_zxy/.ghcup/bin:/home/adv_zxy/go/bin:/home/adv_zxy/.cargo/bin:/usr/share/bcc/tools:/usr/local/sbin:/usr/local/bin:/usr/bin:/opt/android-ndk:/opt/cuda/bin:/opt/cuda/nsight_compute:/opt/cuda/nsight_systems/bin:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/home/adv_zxy/.cabal/bin:/home/adv_zxy/.ft:/home/adv_zxy/.ft:/home/adv_zxy/.ft
2024-09-02T10:43:43.262760905+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.262840275+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.262948029+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.262997653+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.263047638+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.263099647+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.263146355+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.263191871+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.263237658+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.263293334+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.269666913+08:00 [WARN] Theme "Dracula" is using a deprecated style property: scrollbar_thumb.background. Use `scrollbar.thumb.background` instead.
2024-09-02T10:43:43.271171214+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.300316249+08:00 [INFO] Enabling Vulkan Portability
2024-09-02T10:43:43.300355323+08:00 [INFO] Enabling color space support
2024-09-02T10:43:43.306160505+08:00 [INFO] Adapter "NVIDIA GeForce RTX 3060"
2024-09-02T10:43:43.306203266+08:00 [INFO] Ray tracing is supported
2024-09-02T10:43:43.425031528+08:00 [INFO] Using surface present mode MAILBOX
2024-09-02T10:43:43.425070151+08:00 [WARN] Unable to forbid exclusive full screen
2024-09-02T10:43:43.426032795+08:00 [INFO] Creating a descriptor pool for at most 16 sets
2024-09-02T10:43:43.426060628+08:00 [INFO] Creating a descriptor pool for at most 16 sets
2024-09-02T10:43:43.426084483+08:00 [INFO] Initializing Blade pipelines for surface SurfaceInfo { format: Bgra8UnormSrgb, alpha: PreMultiplied }
2024-09-02T10:43:43.433040716+08:00 [INFO] Using GPU: GPUSpecs { is_software_emulated: false, device_name: "NVIDIA GeForce RTX 3060", driver_name: "NVIDIA", driver_info: "560.35.03" }
2024-09-02T10:43:43.435420026+08:00 [INFO] Using surface present mode MAILBOX
2024-09-02T10:43:43.435475992+08:00 [WARN] Unable to forbid exclusive full screen
2024-09-02T10:43:43.435570501+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.437020589+08:00 [INFO] Initializing Blade pipelines for surface SurfaceInfo { format: Bgra8UnormSrgb, alpha: Ignored }
2024-09-02T10:43:43.445693686+08:00 [INFO] Using surface present mode MAILBOX
2024-09-02T10:43:43.445741166+08:00 [WARN] Unable to forbid exclusive full screen
2024-09-02T10:43:43.475485287+08:00 [INFO] Initializing Blade pipelines for surface SurfaceInfo { format: Bgra8UnormSrgb, alpha: PreMultiplied }
2024-09-02T10:43:43.48242045+08:00 [INFO] Using surface present mode MAILBOX
2024-09-02T10:43:43.482469032+08:00 [WARN] Unable to forbid exclusive full screen
2024-09-02T10:43:43.493967264+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.494443416+08:00 [INFO] Opening main db
2024-09-02T10:43:43.495451597+08:00 [INFO] time to first window draw: 347.289989ms
2024-09-02T10:43:43.495648069+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.495711259+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.495748209+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.495784468+08:00 [ERROR] failed to canonicalize root path: No such file or directory (os error 2)
2024-09-02T10:43:43.513063374+08:00 [INFO] Opening main db
2024-09-02T10:43:43.513487037+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.536846067+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.643378104+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:43:43.891713756+08:00 [INFO] Node runtime install_if_needed
2024-09-02T10:43:43.970294711+08:00 [INFO] starting language server. binary path: "/home/adv_zxy/.local/share/zed/node/node-v22.5.1-linux-x64/bin/node", working directory: "/", args: ["/home/adv_zxy/.local/share/zed/copilot/copilot-v0.5.0/dist/agent.js", "--stdio"]
2024-09-02T10:43:44.293905715+08:00 [INFO] Language server with id 0 sent unhandled notification LogMessage:
{
  "level": 0,
  "message": "[DEBUG] [agent] [2024-09-02T02:43:44.290Z] Agent service starting",
  "metadataStr": "[DEBUG] [agent] [2024-09-02T02:43:44.290Z]",
  "extra": [
    "Agent service starting"
  ]
}
2024-09-02T10:43:44.295600908+08:00 [INFO] Language server with id 0 sent unhandled notification client/registerCapability:
{
  "registrations": [
    {
      "id": "aea03361-d467-4f2b-97a2-7626829ee6fd",
      "method": "workspace/didChangeWorkspaceFolders",
      "registerOptions": {}
    }
  ]
}
2024-09-02T10:43:45.008153589+08:00 [INFO] Language server with id 0 sent unhandled notification LogMessage:
{
  "level": 1,
  "message": "[INFO] [auth] [2024-09-02T02:43:45.007Z] Invalid copilot token: missing token: 403 ",
  "metadataStr": "[INFO] [auth] [2024-09-02T02:43:45.007Z]",
  "extra": [
    "Invalid copilot token: missing token: 403 "
  ]
}
2024-09-02T10:43:45.008254971+08:00 [INFO] Language server with id 0 sent unhandled notification window/showMessageRequest:
{
  "type": 2,
  "message": "No access to GitHub Copilot found. You are currently logged in as Frefreak.",
  "actions": [
    {
      "title": "Sign up for GitHub Copilot"
    },
    {
      "title": "Dismiss"
    }
  ]
}
2024-09-02T10:43:45.015053316+08:00 [INFO] Language server with id 0 sent unhandled notification LogMessage:
{
  "level": 0,
  "message": "[DEBUG] [agent] [2024-09-02T02:43:45.010Z] Telemetry initialized",
  "metadataStr": "[DEBUG] [agent] [2024-09-02T02:43:45.010Z]",
  "extra": [
    "Telemetry initialized"
  ]
}
2024-09-02T10:44:01.622605426+08:00 [INFO] Creating a descriptor pool for at most 16 sets
2024-09-02T10:44:01.636841848+08:00 [INFO] Creating a descriptor pool for at most 16 sets
2024-09-02T10:44:01.655357791+08:00 [INFO] Creating a descriptor pool for at most 256 sets
2024-09-02T10:44:01.670070034+08:00 [INFO] Creating a descriptor pool for at most 256 sets
2024-09-02T10:44:04.952611478+08:00 [INFO] open paths ["/home/adv_zxy/.config/zed/settings.json"]
2024-09-02T10:44:04.956341498+08:00 [INFO] Initializing default prettier with plugins {}
2024-09-02T10:44:04.956415748+08:00 [INFO] starting language servers for JSONC: json-language-server
2024-09-02T10:44:04.956466414+08:00 [INFO] starting language server "json-language-server", path: "/home/adv_zxy/.config/zed/settings.json", id: 1
2024-09-02T10:44:04.956626277+08:00 [INFO] Initializing default prettier with plugins {}
2024-09-02T10:44:04.956682644+08:00 [INFO] starting language servers for JSONC: json-language-server
2024-09-02T10:44:04.965028471+08:00 [INFO] fetching latest version of language server "json-language-server"
2024-09-02T10:44:04.965113513+08:00 [INFO] Node runtime install_if_needed
2024-09-02T10:44:04.984680718+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:44:05.64298928+08:00 [INFO] downloading language server "json-language-server"
2024-09-02T10:44:05.643393175+08:00 [INFO] Node runtime install_if_needed
2024-09-02T10:44:05.72581609+08:00 [INFO] starting language server. binary path: "/home/adv_zxy/.local/share/zed/node/node-v22.5.1-linux-x64/bin/node", working directory: "/home/adv_zxy/.config/zed", args: ["/home/adv_zxy/.local/share/zed/languages/json-language-server/node_modules/vscode-langservers-extracted/bin/vscode-json-language-server", "--stdio"]
2024-09-02T10:44:21.083116548+08:00 [INFO] Waiting for default prettier to install
2024-09-02T10:44:21.083189035+08:00 [INFO] Starting prettier at path "/home/adv_zxy/.local/share/zed/prettier"
2024-09-02T10:44:21.083273435+08:00 [INFO] Node runtime install_if_needed
2024-09-02T10:44:21.16204811+08:00 [INFO] starting language server. binary path: "/home/adv_zxy/.local/share/zed/node/node-v22.5.1-linux-x64/bin/node", working directory: "/home/adv_zxy/.local/share/zed/prettier", args: ["/home/adv_zxy/.local/share/zed/prettier/prettier_server.js", "/home/adv_zxy/.local/share/zed/prettier"]
2024-09-02T10:44:21.232600573+08:00 [INFO] Started default prettier in "/home/adv_zxy/.local/share/zed/prettier"
2024-09-02T10:44:21.373251275+08:00 [INFO] starting language servers for JSONC: json-language-server
2024-09-02T10:44:21.374255188+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:44:44.944041647+08:00 [INFO] starting language servers for JSONC: json-language-server
2024-09-02T10:44:44.944907679+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:44:48.568783206+08:00 [INFO] starting language servers for JSONC: json-language-server
2024-09-02T10:44:48.569615484+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:48:38.139869021+08:00 [INFO] starting language servers for JSONC: json-language-server
2024-09-02T10:48:38.140818802+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:48:52.207681401+08:00 [INFO] starting language servers for JSONC: json-language-server
2024-09-02T10:48:52.211228497+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:53:32.339873993+08:00 [INFO] starting language servers for JSONC: json-language-server
2024-09-02T10:53:32.340702435+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:53:40.658357131+08:00 [INFO] starting language servers for JSONC: json-language-server
2024-09-02T10:53:40.664639618+08:00 [WARN] request completed with error: failed to connect to the server
2024-09-02T10:53:43.800879307+08:00 [INFO] starting language servers for JSONC: json-language-server
2024-09-02T10:53:43.801739309+08:00 [WARN] request completed with error: failed to connect to the server

</pre></details>

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Uh oh!

`buffer_font_fallbacks` doesn't seem to work under Linux #17254

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Uh oh!

buffer_font_fallbacks doesn't seem to work under Linux #17254

Description

Description

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If applicable, add mockups / screenshots to help explain present your vision of the feature

If applicable, attach your Zed.log file to this issue.

Metadata

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`buffer_font_fallbacks` doesn't seem to work under Linux #17254