disable apply button on auth match previous or active selection (or contain parent relation), reorganize getters

src/app/browser/window/tab/item/identity/gemini/widget.rs

@@ -93,7 +93,7 @@ impl Widget {
                 this.set_response_enabled(response, false);
 
                 // Result
-                callback(form.list.value())
+                callback(form.list.selected_item().value_enum())
             }
         });
     }

src/app/browser/window/tab/item/identity/gemini/widget/form.rs

@@ -93,9 +93,10 @@ impl Form {
 
     /// Validate `Self` components match current selection
     pub fn is_applicable(&self) -> bool {
-        match self.list.value() {
+        match self.list.selected_item().value_enum() {
             Value::GenerateNewAuth => self.name.is_valid(),
             Value::ImportPem => self.file.is_valid(),
+            Value::ProfileIdentityGeminiId(_) => !self.list.selected_item().is_active(),
             _ => true,
         }
     }

src/app/browser/window/tab/item/identity/gemini/widget/form/list.rs

@@ -120,24 +120,22 @@ impl List {
     /// Run callback function on `connect_selected_notify` event
     /// * return `Value` enum match selected item
     pub fn on_select(&self, callback: impl Fn(Value) + 'static) {
-        self.dropdown.connect_selected_notify(move |this| {
-            callback(
-                this.selected_item()
-                    .and_downcast::<Item>()
-                    .unwrap()
-                    .value_enum(),
-            )
-        });
+        self.dropdown
+            .connect_selected_notify(move |this| callback(selected_item(this).value_enum()));
     }
 
     // Getters
 
-    /// Get formatted `value` match selected item
-    pub fn value(&self) -> Value {
-        self.dropdown
-            .selected_item()
-            .and_downcast::<Item>()
-            .unwrap()
-            .value_enum()
+    /// Get selected `Item` GObject
+    pub fn selected_item(&self) -> Item {
+        selected_item(&self.dropdown)
     }
 }
+
+// Tools
+
+/// Cast and return selected `Item` GObject for any internal
+/// [DropDown](https://docs.gtk.org/gtk4/class.DropDown.html) widget
+fn selected_item(dropdown: &DropDown) -> Item {
+    dropdown.selected_item().and_downcast::<Item>().unwrap()
+}