Port from KPluginSelector to KPluginWidget

The former is deprecated and will be removed in KF6.

Also the replacement does not support the kpart plugins, which is why we have
to query them manually & create a KPluginMetaData object from them.

Task: https://phabricator.kde.org/T12265

CMakeLists.txt

@@ -10,7 +10,7 @@ set (RELEASE_SERVICE_VERSION "${RELEASE_SERVICE_VERSION_MAJOR}.${RELEASE_SERVICE
 project(Konqueror VERSION ${RELEASE_SERVICE_VERSION})
 
 set(QT_MIN_VERSION "5.12.0")
-set(KF5_MIN_VERSION "5.71.0")
+set(KF5_MIN_VERSION "5.79.0")
 
 find_package(ECM ${KF5_MIN_VERSION} CONFIG REQUIRED)
 

src/konqextensionmanager.cpp

@@ -26,14 +26,16 @@
 #else
 #include <KAboutData>
 #endif
+#include <KConfigGroup>
+#include <KFileUtils>
 #include <KLocalizedString>
+#include <KPluginWidget>
+#include <KSharedConfig>
 #include <kparts/plugin.h>
 #include <kplugininfo.h>
 #include <kpluginselector.h>
 #include <ksettings/dispatcher.h>
 #include <kstandardguiitem.h>
-#include <KSharedConfig>
-#include <KConfigGroup>
 
 // Local
 #include "konqview.h"
@@ -42,7 +44,7 @@
 class KonqExtensionManagerPrivate
 {
 public:
-    KPluginSelector *pluginSelector;
+    KPluginWidget *pluginSelector;
     KonqMainWindow *mainWindow;
     KParts::ReadOnlyPart *activePart;
     QDialogButtonBox *buttonBox;
@@ -61,7 +63,7 @@ KonqExtensionManager::KonqExtensionManager(QWidget *parent, KonqMainWindow *main
 
     resize(QSize(640, 480)); // FIXME: hard-coded values ?
 
-    d->pluginSelector = new KPluginSelector(this);
+    d->pluginSelector = new KPluginWidget(this);
     mainLayout->addWidget(d->pluginSelector);
     connect(d->pluginSelector, SIGNAL(changed(bool)), this, SLOT(setChanged(bool)));
     connect(d->pluginSelector, SIGNAL(configCommitted(QByteArray)),
@@ -70,15 +72,22 @@ KonqExtensionManager::KonqExtensionManager(QWidget *parent, KonqMainWindow *main
     d->mainWindow = mainWindow;
     d->activePart = activePart;
 
-    d->pluginSelector->addPlugins(QStringLiteral("konqueror"), i18n("Extensions"), QStringLiteral("Extensions"), KSharedConfig::openConfig());
+    auto addPluginForId = [this](const QString &pluginId) {
+        const QStringList searchPaths =
+            QStandardPaths::locateAll(QStandardPaths::GenericDataLocation, pluginId + QStringLiteral("/kpartplugins"), QStandardPaths::LocateDirectory);
+        const QStringList files = KFileUtils::findAllUniqueFiles(searchPaths, {QStringLiteral("*.desktop")});
+        QVector<KPluginMetaData> metaDataList;
+        metaDataList.reserve(files.count());
+        for (const QString &file : files) {
+            metaDataList << KPluginMetaData::fromDesktopFile(file);
+        }
+        d->pluginSelector->setConfig(KSharedConfig::openConfig(pluginId + QLatin1String("rc"))->group("KParts Plugins"));
+        d->pluginSelector->addPlugins(metaDataList, i18n("Extensions"));
+    };
     if (activePart) {
-#if KPARTS_VERSION >= QT_VERSION_CHECK(5, 77, 0)
-        const QString pluginId = activePart->metaData().pluginId();
-#else
-        const QString pluginId = activePart->componentData().componentName();
-#endif
-        d->pluginSelector->addPlugins(pluginId, i18n("Extensions"), QStringLiteral("Tools"));
-        d->pluginSelector->addPlugins(pluginId, i18n("Extensions"), QStringLiteral("Statusbar"));
+        addPluginForId(activePart->metaData().pluginId());
+    } else {
+        addPluginForId(QStringLiteral("konqueror"));
     }
 
     d->buttonBox = new QDialogButtonBox(QDialogButtonBox::Ok|QDialogButtonBox::Cancel|QDialogButtonBox::RestoreDefaults|QDialogButtonBox::Apply);
@@ -91,8 +100,6 @@ KonqExtensionManager::KonqExtensionManager(QWidget *parent, KonqMainWindow *main
     connect(okButton, SIGNAL(clicked()), SLOT(slotOk()));
     connect(d->buttonBox->button(QDialogButtonBox::Apply), SIGNAL(clicked()), SLOT(slotApply()));
     connect(d->buttonBox->button(QDialogButtonBox::RestoreDefaults), SIGNAL(clicked()), SLOT(slotDefault()));
-
-    d->pluginSelector->load();
 }
 
 KonqExtensionManager::~KonqExtensionManager()