Fix rendering of icon overlays on HighDPI

Use KIconUtils instead of KIconLoader API. The former does HighDPI
correctly.

CMakeLists.txt

@@ -29,6 +29,7 @@ find_package(Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS
 )
 
 find_package(KF5 ${KF5_MIN_VERSION} REQUIRED COMPONENTS
+    GuiAddons
     Notifications
     I18n
     KIO

src/CMakeLists.txt

@@ -15,6 +15,7 @@ add_executable(kbackup ${kbackup_SRCS})
 target_link_libraries(kbackup
                       Qt::Core
                       Qt::Widgets
+                      KF5::GuiAddons
                       KF5::I18n
                       KF5::KIOCore
                       KF5::KIOFileWidgets

src/MainWidget.cxx

@@ -11,7 +11,6 @@
 #include <Archiver.hxx>
 #include <Selector.hxx>
 
-#include <KIconLoader>
 #include <KUrlCompletion>
 
 #include <QPushButton>

src/Selector.cxx

@@ -13,6 +13,7 @@
 #include <kio/global.h>
 #include <KIconLoader>
 #include <KIconEffect>
+#include <KIconUtils>
 #include <KLocalizedString>
 #include <KPropertiesDialog>
 #include <KFileItem>
@@ -369,9 +370,9 @@ void Selector::fillTree(ListItem *parent, const QString &path, bool on)
         folderIcon = QIcon::fromTheme(QStringLiteral("folder")).pixmap(KIconLoader::SizeSmall);
         folderIconHidden = effect.apply(folderIcon, KIconEffect::DeSaturate, 0, QColor(), true);
 
-        folderLinkIcon = KIconLoader::global()->loadIcon(QStringLiteral("folder"), KIconLoader::Small,
-                                                         0, KIconLoader::DefaultState,
-                                                         QStringList(QStringLiteral("emblem-symbolic-link")));
+        folderLinkIcon = KIconUtils::addOverlay(folderIcon,
+                                                QIcon::fromTheme(QStringLiteral("emblem-symbolic-link")),
+                                                Qt::BottomRightCorner).pixmap(KIconLoader::SizeSmall);
 
         folderLinkIconHidden = effect.apply(folderLinkIcon, KIconEffect::DeSaturate, 0, QColor(), true);
       }
@@ -394,9 +395,9 @@ void Selector::fillTree(ListItem *parent, const QString &path, bool on)
         documentIcon = QIcon::fromTheme(QStringLiteral("text-x-generic")).pixmap(KIconLoader::SizeSmall);
         documentIconHidden = effect.apply(documentIcon, KIconEffect::DeSaturate, 0, QColor(), true);
 
-        documentLinkIcon = KIconLoader::global()->loadIcon(QStringLiteral("text-x-generic"), KIconLoader::Small,
-                                                           0, KIconLoader::DefaultState,
-                                                           QStringList(QStringLiteral("emblem-symbolic-link")));
+        documentLinkIcon = KIconUtils::addOverlay(documentIcon,
+                                                QIcon::fromTheme(QStringLiteral("emblem-symbolic-link")),
+                                                Qt::BottomRightCorner).pixmap(KIconLoader::SizeSmall);
 
         documentLinkIconHidden = effect.apply(documentLinkIcon, KIconEffect::DeSaturate, 0, QColor(), true);
       }