Store last used emojis in the state config file

Instead of crumming up the main settings file with the last used emojis,
they now live in the state (where they belong.)

src/models/emojimodel.h

@@ -3,10 +3,11 @@
 
 #pragma once
 
+#include <KConfigGroup>
+#include <KSharedConfig>
 #include <QAbstractListModel>
 #include <QObject>
 #include <QQmlEngine>
-#include <QSettings>
 
 struct Emoji {
     Emoji(QString unicode, QString shortname, bool isCustom = false)
@@ -63,11 +64,6 @@ class EmojiModel : public QAbstractListModel
     QML_ELEMENT
     QML_SINGLETON
 
-    /**
-     * @brief Return a list of recently used emojis.
-     */
-    Q_PROPERTY(QVariantList history READ history NOTIFY historyChanged)
-
     /**
      * @brief Return a list of emoji categories.
      *
@@ -177,7 +173,11 @@ public:
      */
     Q_INVOKABLE QVariantList tones(const QString &baseEmoji) const;
 
-    Q_INVOKABLE QVariantList history() const;
+    /**
+     * @brief Return a list of the last used emoji shortnames
+     */
+    QStringList lastUsedEmojis() const;
+
     QVariantList categories() const;
     QVariantList categoriesWithCustom() const;
 
@@ -190,7 +190,10 @@ public Q_SLOTS:
 private:
     static QHash<Category, QVariantList> _emojis;
 
-    // TODO: Port away from QSettings
-    QSettings m_settings;
+    /// Returns QVariants containing the last used Emojis
+    QVariantList emojiHistory() const;
+
+    KSharedConfig::Ptr m_config;
+    KConfigGroup m_configGroup;
     EmojiModel(QObject *parent = nullptr);
 };