Use nightly rustfmt features

rustfmt.toml

+imports_granularity = "Crate"
+format_code_in_doc_comments = true
+group_imports = "StdExternalCrate"
+newline_style = "Unix"
+normalize_comments = true
+normalize_doc_attributes = true
+wrap_comments = true

src/application.rs

-use crate::config;
-use crate::widgets::Window;
-use adw::prelude::*;
-use gtk::{gio, glib, subclass::prelude::*};
+use adw::{prelude::*, subclass::prelude::*};
+use gtk::{gio, glib};
+
+use crate::{config, widgets::Window};
 
 mod imp {
+    use glib::{once_cell::sync::OnceCell, WeakRef};
+
     use super::*;
-    use adw::subclass::prelude::*;
-    use gtk::glib::{once_cell::sync::OnceCell, WeakRef};
 
     #[derive(Debug, Default)]
     pub struct Application {

src/widgets/image_page.rs

-use gtk::glib;
-use gtk::prelude::*;
-use gtk::subclass::prelude::*;
+use gtk::{glib, prelude::*, subclass::prelude::*};
 
 mod imp {
-    use super::*;
-    use gtk::glib::once_cell::sync::OnceCell;
     use std::cell::RefCell;
 
+    use glib::once_cell::sync::OnceCell;
+
+    use super::*;
+
     #[derive(Debug, Default, glib::Properties, gtk::CompositeTemplate)]
     #[properties(wrapper_type = super::ImagePageWidget)]
     #[template(resource = "/org/gnome/Tour/ui/image-page.ui")]

src/widgets/paginator.rs

 use gtk::{gdk, glib, prelude::*, subclass::prelude::*};
 
 mod imp {
-    use super::*;
     use std::cell::{Cell, RefCell};
 
+    use super::*;
+
     #[derive(Default, Debug, gtk::CompositeTemplate)]
     #[template(resource = "/org/gnome/Tour/ui/paginator.ui")]
     pub struct PaginatorWidget {

src/widgets/window.rs

-use crate::utils::i18n_f;
-use adw::prelude::*;
-use gtk::subclass::prelude::*;
+use adw::{prelude::*, subclass::prelude::*};
 use gtk::{gio, glib};
 
 use super::paginator::PaginatorWidget;
-use crate::Application;
+use crate::{utils::i18n_f, Application};
 
 mod imp {
     use super::*;
-    use crate::config;
-    use crate::widgets::ImagePageWidget;
-    use adw::subclass::prelude::*;
+    use crate::{config, widgets::ImagePageWidget};
 
     #[derive(Debug, Default, gtk::CompositeTemplate)]
     #[template(resource = "/org/gnome/Tour/ui/window.ui")]
@@ -68,7 +64,8 @@ mod imp {
             let version = glib::os_info("VERSION").unwrap_or_else(|| "".into());
 
             let body = i18n_f(
-                // Translators: The following string is formated as "Learn about new and essential features in GNOME 3.36" for example
+                // Translators: The following string is formated as "Learn about new and essential
+                // features in GNOME 3.36" for example
                 "Learn about the key features in {name} {version}.",
                 &[("name", &name), ("version", &version)],
             );