Move textedit example to manual test

Change-Id: Ic3189044598be8e121c1f065e68e04a3547a87d0
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 81db1766dd0dc7c6f1c186688e90dc817a65a65c)
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

examples/widgets/doc/src/textedit.qdoc

@@ -1,15 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
-
-/*!
-    \example richtext/textedit
-    \title Text Edit
-    \ingroup examples-richtext
-    \brief The Text Edit example shows Qt's rich text editing facilities
-    in action.
-
-    \brief The Text Edit example shows Qt's rich text editing facilities in action,
-    providing an example document for you to experiment with.
-
-    \image textedit-demo.png
-*/

examples/widgets/richtext/CMakeLists.txt

@@ -3,4 +3,3 @@
 
 qt_internal_add_example(orderform)
 qt_internal_add_example(syntaxhighlighter)
-qt_internal_add_example(textedit)

examples/widgets/richtext/richtext.pro

@@ -1,4 +1,3 @@
 TEMPLATE    = subdirs
 SUBDIRS     = orderform \
-              syntaxhighlighter \
+              syntaxhighlighter
-              textedit

src/widgets/kernel/qwidget.cpp

@@ -9906,10 +9906,6 @@ void QWidget::actionEvent(QActionEvent *)
 
     Main window applications typically use reimplementations of this function to check
     whether the user's work has been saved and ask for permission before closing.
-    For example, the \l{Text Edit} example uses a helper function to
-    determine whether or not to close the window:
-
-    \snippet richtext/textedit/textedit.cpp closeevent
 
     \sa event(), hide(), close(), QCloseEvent
 */