Remove deprecated method QTextList::isEmpty()

Change-Id: I7acc0bb110c2bed55374576f59c24451afa7742a
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

src/gui/text/qtextlist.cpp

@@ -100,20 +100,6 @@ public:
     \sa QTextBlock, QTextListFormat, QTextCursor
 */
 
-#if QT_DEPRECATED_SINCE(5, 13)
-/*!
-    \fn bool QTextList::isEmpty() const
-    \obsolete
-
-    Returns \c true if the list has no items; otherwise returns \c false.
-
-    \b{Note:} Empty lists are automatically deleted by the QTextDocument that owns
-    them.
-
-    \sa count()
-*/
-#endif
-
 /*! \internal
  */
 QTextList::QTextList(QTextDocument *doc)

src/gui/text/qtextlist.h

@@ -59,12 +59,6 @@ public:
 
     int count() const;
 
-#if QT_DEPRECATED_SINCE(5, 13)
-    QT_DEPRECATED_X("Use count() instead")
-    inline bool isEmpty() const
-    { return count() == 0; }
-#endif
-
     QTextBlock item(int i) const;
 
     int itemNumber(const QTextBlock &) const;