Fix compilation against Qt6 and add CI

src/models/completionmodel.cpp

@@ -16,7 +16,7 @@ CompletionModel::CompletionModel(QObject *parent)
     : QAbstractListModel(parent)
     , m_filterModel(new CompletionProxyModel())
     , m_userListModel(new UserListModel(this))
-    , m_emojiModel(new KConcatenateRowsProxyModel(this))
+    , m_emojiModel(new QConcatenateTablesProxyModel(this))
 {
     connect(this, &CompletionModel::textChanged, this, &CompletionModel::updateCompletion);
     connect(this, &CompletionModel::roomChanged, this, [this]() {

src/models/completionmodel.h

@@ -3,10 +3,9 @@
 
 #pragma once
 
+#include <QConcatenateTablesProxyModel>
 #include <QSortFilterProxyModel>
 
-#include <KConcatenateRowsProxyModel>
-
 #include "roomlistmodel.h"
 
 class CompletionProxyModel;
@@ -75,6 +74,6 @@ private:
 
     UserListModel *m_userListModel;
     RoomListModel *m_roomListModel;
-    KConcatenateRowsProxyModel *m_emojiModel;
+    QConcatenateTablesProxyModel *m_emojiModel;
 };
 Q_DECLARE_METATYPE(CompletionModel::AutoCompletionType);