Allow retrieval of match contexts from key filter model

GnuPG-bug-id: 5388

src/kleo/keyfilter.h

@@ -94,3 +94,6 @@ Q_DECLARE_OPERATORS_FOR_FLAGS(KeyFilter::MatchContexts)
 
 }
 
+#include <QObject>
+
+Q_DECLARE_METATYPE(Kleo::KeyFilter::MatchContexts)

src/kleo/keyfiltermanager.cpp

@@ -333,9 +333,12 @@ QVariant Model::data(const QModelIndex &idx, int role) const
     case Qt::ToolTipRole:  /* Most useless tooltip ever.  */
         return filter->name();
 
-    case Qt::UserRole:
+    case KeyFilterManager::FilterIdRole:
         return filter->id();
 
+    case KeyFilterManager::FilterMatchContextsRole:
+        return QVariant::fromValue(filter->availableMatchContexts());
+
     default:
         return QVariant();
     }

src/kleo/keyfiltermanager.h

@@ -34,6 +34,12 @@ namespace Kleo
 class KLEO_EXPORT KeyFilterManager : public QObject
 {
     Q_OBJECT
+public:
+    enum ModelRoles {
+        FilterIdRole = Qt::UserRole,
+        FilterMatchContextsRole,
+    };
+
 protected:
     explicit KeyFilterManager(QObject *parent = nullptr);
     ~KeyFilterManager();