wallpapers/image: replace `openFolder` with `Qt.openUrlExternally`

This makes ImageBackend lighter.

wallpapers/image/plugin/imagebackend.cpp

@@ -21,11 +21,7 @@
 #include <QScreen>
 #include <QStandardPaths>
 
-#include <KIO/CopyJob>
-#include <KIO/Job>
-#include <KIO/OpenUrlJob>
 #include <KLocalizedString>
-#include <KNotificationJobUiDelegate>
 
 #include "debug.h"
 #include "finder/packagefinder.h"
@@ -453,16 +449,6 @@ void ImageBackend::slotSlideModelDataChanged(const QModelIndex &topLeft, const Q
     }
 }
 
-void ImageBackend::openFolder(const QString &path)
-{
-    // TODO: Move to SlideFilterModel
-    auto *job = new KIO::OpenUrlJob(QUrl::fromLocalFile(path));
-    auto *delegate = new KNotificationJobUiDelegate;
-    delegate->setAutoErrorHandlingEnabled(true);
-    job->setUiDelegate(delegate);
-    job->start();
-}
-
 QStringList ImageBackend::uncheckedSlides() const
 {
     return m_uncheckedSlides;

wallpapers/image/plugin/imagebackend.h

@@ -67,7 +67,6 @@ public:
     // this is for QML use
     Q_INVOKABLE void addSlidePath(const QUrl &url);
     Q_INVOKABLE void removeSlidePath(const QString &path);
-    Q_INVOKABLE void openFolder(const QString &path);
 
     Q_INVOKABLE void showFileDialog();
 

wallpapers/image/slideshowpackage/contents/ui/SlideshowComponent.qml

@@ -220,7 +220,7 @@ ColumnLayout {
                         Kirigami.Action {
                             icon.name: "document-open-folder"
                             tooltip: i18nd("plasma_wallpaper_org.kde.image", "Open Folder")
-                            onTriggered: imageWallpaper.openFolder(modelData)
+                            onTriggered: Qt.openUrlExternally(modelData)
                         }
                     ]
                 }