service/tray: provide default sorting for SystemTray.items

Items are first sorted by category, and then by name.

src/core/model.hpp

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <functional>
+
 #include <bit>
 #include <qabstractitemmodel.h>
 #include <qcontainerfwd.h>
@@ -98,6 +100,19 @@ public:
 		this->UntypedObjectModel::insertObject(object, index);
 	}
 
+	void insertObjectSorted(T* object, const std::function<bool(T*, T*)>& compare) {
+		auto& list = this->valueList();
+		auto iter = list.begin();
+
+		while (iter != list.end()) {
+			if (!compare(object, *iter)) break;
+			++iter;
+		}
+
+		auto idx = iter - list.begin();
+		this->UntypedObjectModel::insertObject(object, idx);
+	}
+
 	void removeObject(const T* object) { this->UntypedObjectModel::removeObject(object); }
 
 	// Assumes only one instance of a specific value

src/services/status_notifier/qml.cpp

@@ -17,10 +17,20 @@ SystemTray::SystemTray(QObject* parent): QObject(parent) {
 	// clang-format on
 
 	for (auto* item: host->items()) {
-		this->mItems.insertObject(item);
+		this->mItems.insertObjectSorted(item, &SystemTray::compareItems);
 	}
 }
 
-void SystemTray::onItemRegistered(StatusNotifierItem* item) { this->mItems.insertObject(item); }
+void SystemTray::onItemRegistered(StatusNotifierItem* item) {
+	this->mItems.insertObjectSorted(item, &SystemTray::compareItems);
+}
+
 void SystemTray::onItemUnregistered(StatusNotifierItem* item) { this->mItems.removeObject(item); }
 ObjectModel<StatusNotifierItem>* SystemTray::items() { return &this->mItems; }
+
+bool SystemTray::compareItems(
+    qs::service::sni::StatusNotifierItem* a,
+    qs::service::sni::StatusNotifierItem* b
+) {
+	return a->category() > b->category() || a->id().compare(b->id(), Qt::CaseInsensitive) >= 0;
+}

src/services/status_notifier/qml.hpp

@@ -31,5 +31,8 @@ private slots:
 	void onItemUnregistered(qs::service::sni::StatusNotifierItem* item);
 
 private:
+	static bool
+	compareItems(qs::service::sni::StatusNotifierItem* a, qs::service::sni::StatusNotifierItem* b);
+
 	ObjectModel<qs::service::sni::StatusNotifierItem> mItems {this};
 };