Doc: replace QItemDelegate with QStyledItemDelegate

Since QStyledItemDelegate should be preferred over QItemDelegate the
documentation should point to QStyledItemDelegate instead.
Also mark some internal classes which derive from QItemDelegate so they
will not be forgotten during Qt6 porting.

Change-Id: I2dd17feedf8593afac5ca16d2546e1f0bc0250ae
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Konstantin Shegunov <kshegunov@gmail.com>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/widgets/itemviews/qlistwidget.cpp b/src/widgets/itemviews/qlistwidget.cpp
index ea92c5605b..3b3a72cd4f 100644
--- a/src/widgets/itemviews/qlistwidget.cpp
+++ b/src/widgets/itemviews/qlistwidget.cpp
@@ -1757,7 +1757,7 @@ QWidget *QListWidget::itemWidget(QListWidgetItem *item) const
 
     This function should only be used to display static content in the place of
     a list widget item. If you want to display custom dynamic content or
-    implement a custom editor widget, use QListView and subclass QItemDelegate
+    implement a custom editor widget, use QListView and subclass QStyledItemDelegate
     instead.
 
     \sa itemWidget(), removeItemWidget(), {Delegate Classes}