bb91219b26
... when the user passes size = -1. std::char_traits<char32_t>::length() doesn't appear to be an any better implementation than our simple loop, but maybe some compiler will optimize it. wcslen() is usually optimized in the C libraries, even for Unix platforms that hardly ever use it (it's used as a fallback in qustrlen() for non-x86 Windows systems). Pick-to: 6.8 Change-Id: Ia143270869a3a7cf5754fffdc17e500fc454397b Reviewed-by: Edward Welbourne <edward.welbourne@qt.io> (cherry picked from commit b98cf4fc4afaf55145c34ba06d61fec38fadc25d) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>