QtWidgets: replace 0 with \nullptr in documentation

Replace 0 with \nullptr in the documentation.
As a drive-by also replace some 0 with nullptr in the corresponding
code.

Change-Id: I8d7e9c838da1399988a830669d58fc7f2f010696
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/widgets/widgets/qtabbar.cpp b/src/widgets/widgets/qtabbar.cpp
index 68453e1842..05a98fc1a5 100644
--- a/src/widgets/widgets/qtabbar.cpp
+++ b/src/widgets/widgets/qtabbar.cpp
@@ -2567,7 +2567,7 @@ void QTabBar::setChangeCurrentOnDrag(bool change)
 
     The tab bar will take ownership of the widget and so all widgets set here
     will be deleted by the tab bar when it is destroyed unless you separately
-    reparent the widget after setting some other widget (or 0).
+    reparent the widget after setting some other widget (or \nullptr).
 
     \sa tabsClosable()
   */
@@ -2597,14 +2597,14 @@ void QTabBar::setTabButton(int index, ButtonPosition position, QWidget *widget)
 }
 
 /*!
-    Returns the widget set a tab \a index and \a position or 0 if
-    one is not set.
+    Returns the widget set a tab \a index and \a position or \nullptr
+    if one is not set.
   */
 QWidget *QTabBar::tabButton(int index, ButtonPosition position) const
 {
     Q_D(const QTabBar);
     if (index < 0 || index >= d->tabList.count())
-        return 0;
+        return nullptr;
     if (position == LeftSide)
         return d->tabList.at(index).leftWidget;
     else