Remove flattreeview example

The relevant bits are a two-line snippet.

Change-Id: Id1731e5bc6585b1d1fd684817b39d19ad0a8a9cc
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>
(cherry picked from commit ce13dc8c2f73408ce2897f4bd044560955e38145)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

examples/widgets/itemviews/CMakeLists.txt

@@ -10,7 +10,6 @@ qt_internal_add_example(customsortfiltermodel)
 qt_internal_add_example(dirview)
 qt_internal_add_example(editabletreemodel)
 qt_internal_add_example(fetchmore)
-qt_internal_add_example(flattreeview)
 qt_internal_add_example(frozencolumn)
 qt_internal_add_example(interview)
 qt_internal_add_example(pixelator)

examples/widgets/itemviews/flattreeview/CMakeLists.txt

@@ -1,36 +0,0 @@
-# Copyright (C) 2022 The Qt Company Ltd.
-# SPDX-License-Identifier: BSD-3-Clause
-
-cmake_minimum_required(VERSION 3.16)
-project(flattreeview LANGUAGES CXX)
-
-if(NOT DEFINED INSTALL_EXAMPLESDIR)
-    set(INSTALL_EXAMPLESDIR "examples")
-endif()
-
-set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/itemviews/flattreeview")
-
-find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
-
-qt_standard_project_setup()
-
-qt_add_executable(flattreeview
-    main.cpp
-)
-
-set_target_properties(flattreeview PROPERTIES
-    WIN32_EXECUTABLE TRUE
-    MACOSX_BUNDLE TRUE
-)
-
-target_link_libraries(flattreeview PRIVATE
-    Qt6::Core
-    Qt6::Gui
-    Qt6::Widgets
-)
-
-install(TARGETS flattreeview
-    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
-    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
-    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
-)

examples/widgets/itemviews/flattreeview/flattreeview.pro

@@ -1,7 +0,0 @@
-QT += widgets
-
-SOURCES     = main.cpp
-
-# install
-target.path = $$[QT_INSTALL_EXAMPLES]/widgets/itemviews/flattreeview
-INSTALLS += target

examples/widgets/itemviews/flattreeview/main.cpp

@@ -1,37 +0,0 @@
-// Copyright (C) 2017 Klaralvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author David Faure <david.faure@kdab.com>
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
-
-/*
-  main.cpp
-
-  A simple example that shows a multi-column list using QTreeView.
-  The data is not a tree, so the first column was made movable.
-*/
-
-#include <QApplication>
-#include <QHeaderView>
-#include <QStandardItemModel>
-#include <QTreeView>
-
-int main(int argc, char *argv[])
-{
-    QApplication app(argc, argv);
-
-    QStandardItemModel model(4, 2);
-    QTreeView treeView;
-    treeView.setModel(&model);
-    treeView.setRootIsDecorated(false);
-    treeView.header()->setFirstSectionMovable(true);
-    treeView.header()->setStretchLastSection(true);
-
-    for (int row = 0; row < 4; ++row) {
-        for (int column = 0; column < 2; ++column) {
-            QModelIndex index = model.index(row, column, QModelIndex());
-            model.setData(index, QVariant((row + 1) * (column + 1)));
-        }
-    }
-
-    treeView.setWindowTitle(QObject::tr("Flat Tree View"));
-    treeView.show();
-    return app.exec();
-}

examples/widgets/itemviews/itemviews.pro

@@ -8,7 +8,6 @@ SUBDIRS       = addressbook \
                 dirview \
                 editabletreemodel \
                 fetchmore \
-                flattreeview \
                 frozencolumn \
                 interview \
                 pixelator \

src/widgets/itemviews/qheaderview.cpp

@@ -1137,6 +1137,11 @@ bool QHeaderView::sectionsMovable() const
     In such a scenario, it is recommended to call QTreeView::setRootIsDecorated(false)
     as well.
 
+    \code
+    treeView->setRootIsDecorated(false);
+    treeView->header()->setFirstSectionMovable(true);
+    \endcode
+
     Setting it to true has no effect unless setSectionsMovable(true) is called
     as well.