upgrade gtk-rs version

examples/app_library/window_inner/imp.rs

@@ -0,0 +1,28 @@
+use gtk4::glib;
+use gtk4::subclass::prelude::*;
+use gtk4::SearchEntry;
+use once_cell::sync::OnceCell;
+
+use crate::app_grid::AppGrid;
+use crate::group_grid::GroupGrid;
+
+#[derive(Default)]
+pub struct AppLibraryWindowInner {
+    pub entry: OnceCell<SearchEntry>,
+    pub app_grid: OnceCell<AppGrid>,
+    pub group_grid: OnceCell<GroupGrid>,
+}
+
+#[glib::object_subclass]
+impl ObjectSubclass for AppLibraryWindowInner {
+    // `NAME` needs to match `class` attribute of template
+    const NAME: &'static str = "AppLibraryWindowInner";
+    type Type = super::AppLibraryWindowInner;
+    type ParentType = gtk4::Box;
+}
+
+impl ObjectImpl for AppLibraryWindowInner {}
+
+impl WidgetImpl for AppLibraryWindowInner {}
+
+impl BoxImpl for AppLibraryWindowInner {}