core/icon: stop reusing image ids (dbusmenu, notifications)

Fixes issues caused by the QML engine caching old pixmaps using the
same IDs as new ones, notably dbusmenu icons.

src/services/notifications/dbusimage.hpp

@@ -1,7 +1,5 @@
 #pragma once
 
-#include <utility>
-
 #include <qdbusargument.h>
 #include <qimage.h>
 #include <qobject.h>
@@ -23,14 +21,22 @@ struct DBusNotificationImage {
 const QDBusArgument& operator>>(const QDBusArgument& argument, DBusNotificationImage& pixmap);
 const QDBusArgument& operator<<(QDBusArgument& argument, const DBusNotificationImage& pixmap);
 
-class NotificationImage: public QsImageHandle {
+class NotificationImage: public QsIndexedImageHandle {
 public:
-	explicit NotificationImage(DBusNotificationImage image, QObject* parent)
-	    : QsImageHandle(QQuickAsyncImageProvider::Image, parent)
-	    , image(std::move(image)) {}
+	explicit NotificationImage(): QsIndexedImageHandle(QQuickAsyncImageProvider::Image) {}
+
+	[[nodiscard]] bool hasData() const { return !this->image.data.isEmpty(); }
+	void clear() { this->image.data.clear(); }
+
+	[[nodiscard]] DBusNotificationImage& writeImage() {
+		this->imageChanged();
+		return this->image;
+	}
 
 	QImage requestImage(const QString& id, QSize* size, const QSize& requestedSize) override;
 
+private:
 	DBusNotificationImage image;
 };
+
 } // namespace qs::service::notifications

src/services/notifications/notification.cpp

@@ -1,5 +1,4 @@
 #include "notification.hpp"
-#include <utility>
 
 #include <qcontainerfwd.h>
 #include <qdbusargument.h>
@@ -117,13 +116,12 @@ void Notification::updateProperties(
 
 	QString imagePath;
 
-	if (!imageDataName.isEmpty()) {
+	if (imageDataName.isEmpty()) {
+		this->mImagePixmap.clear();
+	} else {
 		auto value = hints.value(imageDataName).value<QDBusArgument>();
-		DBusNotificationImage image;
-		value >> image;
-		if (this->mImagePixmap) this->mImagePixmap->deleteLater();
-		this->mImagePixmap = new NotificationImage(std::move(image), this);
-		imagePath = this->mImagePixmap->url();
+		value >> this->mImagePixmap.writeImage();
+		imagePath = this->mImagePixmap.url();
 	}
 
 	// don't store giant byte arrays longer than necessary
@@ -131,7 +129,7 @@ void Notification::updateProperties(
 	hints.remove("image_data");
 	hints.remove("icon_data");
 
-	if (!this->mImagePixmap) {
+	if (!this->mImagePixmap.hasData()) {
 		QString imagePathName;
 		if (hints.contains("image-path")) imagePathName = "image-path";
 		else if (hints.contains("image_path")) imagePathName = "image_path";

src/services/notifications/notification.hpp

@@ -12,11 +12,10 @@
 
 #include "../../core/retainable.hpp"
 #include "../../core/util.hpp"
+#include "dbusimage.hpp"
 
 namespace qs::service::notifications {
 
-class NotificationImage;
-
 ///! The urgency level of a Notification.
 /// See @@Notification.urgency.
 class NotificationUrgency: public QObject {
@@ -187,7 +186,7 @@ private:
 	quint32 mId;
 	NotificationCloseReason::Enum mCloseReason = NotificationCloseReason::Dismissed;
 	bool mLastGeneration = false;
-	NotificationImage* mImagePixmap = nullptr;
+	NotificationImage mImagePixmap;
 	QList<NotificationAction*> mActions;
 
 	// clang-format off

src/services/status_notifier/item.cpp

@@ -282,7 +282,7 @@ void StatusNotifierItem::onGetAllFailed() const {
 }
 
 TrayImageHandle::TrayImageHandle(StatusNotifierItem* item)
-    : QsImageHandle(QQmlImageProviderBase::Pixmap, item)
+    : QsImageHandle(QQmlImageProviderBase::Pixmap)
     , item(item) {}
 
 QPixmap