KStandardItemListWidget: select by number of unicode chars

Previously during rename, the number of QChar is used for selection,
which might be different from number of unicode characters.

Test plan:
- create the file zz❤️❤️.txt
- rename the file
- verify that the first 4 characters are correctly selected, which
  didn't work before the patch.

BUG: 466814

1 files changed, 1 insertions, 1 deletions

diff --git a/src/kitemviews/kfileitemlistwidget.h b/src/kitemviews/kfileitemlistwidget.h
index 6e98e03c4..5ce11b6da 100644
--- a/src/kitemviews/kfileitemlistwidget.h
+++ b/src/kitemviews/kfileitemlistwidget.h
@@ -62,7 +62,7 @@ protected:
     QFont customizedFont(const QFont &baseFont) const override;
 
     /**
-     * @return Selection length without MIME-type extension
+     * @return Selection length without MIME-type extension in number of unicode characters, which might be different from number of QChars.
      */
     int selectionLength(const QString &text) const override;