[keyboard] Restore the notion of PC105 default index

src/modules/keyboard/KeyboardLayoutModel.cpp

@@ -19,11 +19,17 @@ KeyboardModelsModel::KeyboardModelsModel( QObject* parent )
 {
     // The models map is from human-readable names (!) to xkb identifier
     const auto models = KeyboardGlobal::getKeyboardModels();
+    int index = 0;
     for ( const auto& key : models.keys() )
     {
         // So here *key* is the key in the map, which is the human-readable thing,
         //   while the struct fields are xkb-id, and human-readable
         m_list << ModelInfo { models[ key ], key };
+        if ( models[ key ] == "pc105" )
+        {
+            m_defaultPC105 = index;
+        }
+        index++;
     }
 
     cDebug() << "Loaded" << m_list.count() << "keyboard models";

src/modules/keyboard/KeyboardLayoutModel.h

@@ -54,6 +54,8 @@ public:
     QHash< int, QByteArray > roleNames() const override;
 
     void setCurrentIndex( int index );
+    /// @brief Set the index back to PC105 (the default physical model)
+    void setCurrentIndex() { setCurrentIndex( m_defaultPC105 ); }
     int currentIndex() const { return m_currentIndex; }
 
 signals:
@@ -68,7 +70,8 @@ private:
         QString label;
     };
     QVector< ModelInfo > m_list;
-    int m_currentIndex;
+    int m_currentIndex = -1;
+    int m_defaultPC105 = -1;  ///< The index of pc105, if there is one
 };
 
 class KeyboardLayoutModel : public QAbstractListModel