Gtk4 Rust示例text_viewer编译报错及切换Commit后问题求助

问题背景 #

我在测试gtk4-rs主分支的示例代码时，大部分示例都能正常编译运行，但text_viewer示例执行cargo run --bin text_viewer时失败，核心错误是error[E0432]: unresolved import gtk::FileDialog``，提示gtk根模块里没有FileDialog这个项。

我的环境信息：

• 系统：Linux Mint 21.2
• Gtk版本：4.6.6
• 示例目录下的Cargo.toml配置：

[dependencies.gtk]
path = "../gtk4"
package = "gtk4"
features = ["v4_6"]

完整编译错误输出如下：

oz-mint@ozmint-MACH-WX9:~/tmp/gtk4-rs-master/examples$ cargo run --bin text_viewer
warning: some crates are on edition 2021 which defaults to `resolver = "2"`, but virtual workspaces default to `resolver = "1"`
note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
    Skipping git submodule `https://github.com/gtk-rs/gir` due to update strategy in .gitmodules
    Skipping git submodule `https://github.com/gtk-rs/gir-files` due to update strategy in .gitmodules
warning: private item shadows public glob re-export
   --> gdk4/src/lib.rs:85:1
    |
85  | mod functions;
    | ^^^^^^^^^^^^^^
    |
note: the name `functions` in the type namespace is supposed to be publicly re-exported here
   --> gdk4/src/lib.rs:110:9
    |
110 | pub use auto::*;
    |         ^^^^^^^
note: but the private item here shadows it
   --> gdk4/src/lib.rs:85:1
    |
85  | mod functions;
    | ^^^^^^^^^^^^^^
    = note: `#[warn(hidden_glob_reexports)]` on by default

warning: `gdk4` (lib) generated 1 warning
warning: private item shadows public glob re-export
   --> gtk4/src/lib.rs:148:1
    |
148 | mod functions;
    | ^^^^^^^^^^^^^^
    |
note: the name `functions` in the type namespace is supposed to be publicly re-exported here
   --> gtk4/src/lib.rs:105:9
    |
105 | pub use auto::*;
    |         ^^^^^^^
note: but the private item here shadows it
   --> gtk4/src/lib.rs:148:1
    |
148 | mod functions;
    | ^^^^^^^^^^^^^^
    = note: `#[warn(hidden_glob_reexports)]` on by default

warning: `gtk4` (lib) generated 1 warning
   Compiling gtk4-rs-examples v0.1.0 (/home/oz-mint/tmp/gtk4-rs-master/examples)
error[E0432]: unresolved import `gtk::FileDialog`
 --> examples/text_viewer/main.rs:7:71
  |
7 | use gtk::{gio, glib, Application, ApplicationWindow, Builder, Button, FileDialog, TextView};
  |                                                                       ^^^^^^^^^^ no `FileDialog` in the root

For more information about this error, try `rustc --explain E0432`.
error: could not compile `gtk4-rs-examples` (bin "text_viewer") due to previous error

另外，我已经测试过官方的Hello World示例，能正常运行，说明Gtk的Rust绑定本身是正常工作的。

尝试解决后的新问题 #

后来了解到FileDialog是Gtk 4.10及以上版本才有的API，而我当前系统是4.6.6，所以我切换到了一个较早的Commit：

oz-mint@ozmint-MACH-WX9:~/tmp/gtk4-rs$ git checkout 06f5c84c936f046d17a9d5ddd00d64a70f20c056

切换完成后再次运行cargo run --bin text_viewer，又出现了新的错误：找不到cairo-rs包，提示该包被gtk4依赖，但在指定的仓库路径里找不到。

完整错误输出：

oz-mint@ozmint-MACH-WX9:~/tmp/gtk4-rs$ cd examples/
oz-mint@ozmint-MACH-WX9:~/tmp/gtk4-rs/examples$ cargo run --bin text_viewer
    Updating crates.io index
    Updating git repository `https://github.com/gtk-rs/gtk-rs`
    Skipping git submodule `https://github.com/gtk-rs/gir` due to update strategy in .gitmodules
    Skipping git submodule `https://github.com/gtk-rs/gir-files` due to update strategy in .gitmodules
error: no matching package named `cairo-rs` found
location searched: https://github.com/gtk-rs/gtk-rs
required by package `gtk4 v0.1.0 (/home/oz-mint/tmp/gtk4-rs/gtk4)`

想请教一下，我该怎么调整配置或者操作，才能让text_viewer示例正常编译运行？

内容的提问来源于stack exchange，提问作者ozkanpakdil