QWidget: replace manual memory management with unique_ptr [6/N]: extra

Had to port a lot of caching temporaries, too. Decided to leave them as
crefs to unique_ptr to catch any mischief users may be doing with the
raw pointer instead (like deleting it).

Also fixed a use of 0 as nullptr (by standardizing on pointer-to-bool
conversion, as is done everywhere else in qwidget.cpp), and made one
impregnable if condition readable.

Change-Id: Ifdc240bf352c52de0bc3c186fa7a5f4cb2882dd0
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

0 files changed, 0 insertions, 0 deletions