Port away from deprecated KDirLister API

Error messages are now available as signal directly, considerably
simplifying this.

src/kirigami-filepicker/CMakeLists.txt

 set(filepicker_lib_SRCS
     api/mobilefiledialog.cpp
     api/mobilefiledialog.h
-    declarative/dirlister.cpp
-    declarative/dirlister.h
     declarative/dirmodel.cpp
     declarative/dirmodel.h
     declarative/dirmodelutils.cpp

src/kirigami-filepicker/declarative/dirlister.cpp

-// SPDX-FileCopyrightText: 2020 Jonah Brüchert <jbb@kaidan.im>
-//
-// SPDX-License-Identifier: LGPL-2.0-or-later
-
-#include "dirlister.h"
-
-#include <KIO/Job>
-
-DirLister::DirLister(QObject *parent)
-    : KDirLister(parent)
-{
-}
-
-void DirLister::handleError(KIO::Job *job)
-{
-    handleErrorMessage(job->errorString());
-}
-
-void DirLister::handleErrorMessage(const QString &message)
-{
-    Q_EMIT errorOccured(message);
-}

src/kirigami-filepicker/declarative/dirlister.h

-// SPDX-FileCopyrightText: 2020 Jonah Brüchert <jbb@kaidan.im>
-//
-// SPDX-License-Identifier: LGPL-2.0-or-later
-
-#pragma once
-
-#include <KDirLister>
-#include <QObject>
-
-class DirLister : public KDirLister
-{
-    Q_OBJECT
-
-public:
-    explicit DirLister(QObject *parent = nullptr);
-
-    void handleError(KIO::Job *job) override;
-    void handleErrorMessage(const QString &message) override;
-
-Q_SIGNALS:
-    void errorOccured(const QString &message);
-};

src/kirigami-filepicker/declarative/dirmodel.cpp

@@ -6,18 +6,17 @@
 #include "dirmodel.h"
 
 #include <KDirLister>
-
-#include "dirlister.h"
+#include <KIO/Job>
 
 DirModel::DirModel(QObject *parent)
     : KDirSortFilterProxyModel(parent)
-    , m_lister(new DirLister(this))
+    , m_lister(new KDirLister(this))
 {
     setSourceModel(&m_dirModel);
     m_dirModel.setDirLister(m_lister);
     connect(m_lister, QOverload<>::of(&KCoreDirLister::completed), this, &DirModel::isLoadingChanged);
-    connect(m_lister, &DirLister::errorOccured, this, [this](const QString &message) {
-        m_lastError = message;
+    connect(m_lister, &KDirLister::jobError, this, [this](KIO::Job *job) {
+        m_lastError = job->errorString();
         Q_EMIT lastErrorChanged();
     });
 }

src/kirigami-filepicker/declarative/dirmodel.h

@@ -11,7 +11,7 @@
 
 #include <KDirModel>
 #include <KDirSortFilterProxyModel>
-class DirLister;
+class KDirLister;
 
 class DirModel : public KDirSortFilterProxyModel
 {
@@ -74,7 +74,7 @@ Q_SIGNALS:
 
 private:
     KDirModel m_dirModel;
-    DirLister *m_lister;
+    KDirLister *m_lister;
 
     QString m_lastError;
 };