fix: little black square icon show again

- reset model to fix black square icon
- if icon is fullpath convert to url

Issue: linuxdeepin/developer-center#8577

src/models/appitem.cpp

@@ -4,6 +4,8 @@
 
 #include "appitem.h"
 
+#include <QFileInfo>
+
 AppItem::AppItem(const QString &freedesktopId)
     : QStandardItem()
 {
@@ -47,7 +49,12 @@ const QString AppItem::iconName() const
 
 void AppItem::setIconName(const QString &iconName)
 {
-    setData(iconName.isEmpty() ? "application-x-desktop" : iconName, AppItem::IconNameRole);
+    QString name = iconName;
+    if (QFileInfo(iconName).isAbsolute()) {
+        name = QUrl::fromLocalFile(iconName).toString(); // path ==> file://path
+    }
+
+    setData(iconName.isEmpty() ? "application-x-desktop" : name, AppItem::IconNameRole);
 }
 
 const QStringList AppItem::categories() const

src/models/appsmodel.cpp

@@ -197,14 +197,17 @@ QVariant AppsModel::data(const QModelIndex &index, int role) const
 
 void AppsModel::updateModelData()
 {
-    // TODO release icon's cache when gtk's icon-theme.cache is updated.
-    IconUtils::tryUpdateIconCache();
+    beginResetModel();
+    qDebug() << "reset model.";
+
     QList<AppItem *> items(allAppInfosShouldBeShown());
     cleanUpInvalidApps(items);
     QList<AppItem *> duplicatedItems = updateItems(items);
     for (AppItem * item : std::as_const(duplicatedItems)) {
         delete item;
     }
+
+    endResetModel();
 }
 
 // the caller manage the return values' ownership (i.e. might need to free them)