better performance to add items to the completer

BUGS: 421646
FIXED-IN: 7.0.0

NEWS

@@ -741,4 +741,5 @@ BUGFIXES:
 705 ==> 421559 - HEIC: Failed to open the data source: Too many open files (errno = 24).
 706 ==> 421464 - XPkeywords not being updated.
 707 ==> 421521 - Wrong EXIF photograph properties shown when there is no EXIF data at all.
-708 ==> 
+708 ==> 421646 - Impossible to add new tag.
+709 ==> 

core/libs/tags/widgets/tageditdlg.cpp

@@ -161,6 +161,7 @@ TagEditDlg::TagEditDlg(QWidget* const parent, TAlbum* const album, bool create)
 
     if (d->create)
     {
+        QStringList tagPaths;
         AlbumList tList = AlbumManager::instance()->allTAlbums();
 
         for (AlbumList::const_iterator it = tList.constBegin() ; it != tList.constEnd() ; ++it)
@@ -169,9 +170,11 @@ TagEditDlg::TagEditDlg(QWidget* const parent, TAlbum* const album, bool create)
 
             if (tag && !tag->isInternalTag())
             {
-                d->titleEdit->completerModel()->addItem(tag->tagPath());
+                tagPaths << tag->tagPath();
             }
         }
+
+        d->titleEdit->completerModel()->addItems(tagPaths);
     }
     else
     {

core/libs/widgets/text/modelcompleter.cpp

@@ -151,6 +151,12 @@ void ModelCompleter::addItem(const QString& item)
     d->stringModel->sort(0);
 }
 
+void ModelCompleter::addItems(const QStringList& items)
+{
+    d->stringModel->setStringList(items);
+    d->stringModel->sort(0);
+}
+
 QStringList ModelCompleter::items() const
 {
     return d->stringModel->stringList();

core/libs/widgets/text/modelcompleter.h

@@ -60,6 +60,7 @@ public:
     QAbstractItemModel* itemModel() const;
 
     void addItem(const QString& item);
+    void addItems(const QStringList& items);
     QStringList items()             const;
 
 Q_SIGNALS: