QString::sprintf(), like the C printf-family, always includes two
digits in any exponent it outputs. Up to 5.6, number() and arg()
taking a double did the same; but changes at 5.7 to enable opting out
of the leading zero this implies for a single-digit exponent
accidentally opted out of it in args() and number(). This commit
fixes number() and arg() to include QLocaleData::ZeroPadExponent in
the flags they pass down to the C locale's doubleToString(), restoring
the prior behavior, including consistency with sprintf().
[ChangeLog][QtCore][QString] Formatting of doubles with single-digit
exponent, by number() or args(), now includes a leading zero in that
exponent, consistently with sprintf(), as it did up to 5.6.
Task-number: QTBUG-63620
Change-Id: I10c491902b8556e9f19e605177ead8d9fd32abd9
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
91f3687ee5