923918c66b
A null QString / QStringView has a null begin pointer stored as its array beginning (something we hide a little in the QString::data() function, but not in QStringView::data()). We've been passing a null pointer to memcpy() every time someone passed a null QStringView for QString's single-argument arg() call, though not the multi-string arg() version (which is the only one QStringView offers). Commit f5021835dfb4b0bf974794b598cbdf9f0f95898d made this worse by making QStringViews created from null QStrings retain the nullness (as was intended). Fixes: QTBUG-120624 Pick-to: 6.6 6.5 6.2 Change-Id: I6e2677aad2ab45759db2fffd17a870639b19340b Reviewed-by: Marc Mutz <marc.mutz@qt.io> (cherry picked from commit d351a97e85e5ed8acd7ad1357ef76dc2e0ad639f) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>