Fix handling of grouping characters when validating doubles

In QDoubleSpinBoxPrivate::validateAndInterpret() some code still
assumed checking one entry in a QString is enough (it isn't - the
grouping separator may be a surrogate pair) and nothing considered the
case of an empty grouping separator (as can arise if the user sets
that in their system configuration, as a brute-force way to suppress
digit-grouping). Failure to consider this case failed an assertion on
dereferencing the first character of the separator.

Handle the case of empty separator and suppress tests that try to
match a separator, when there is no separator.

Pick-to: 6.2
Fixes: QTBUG-96734
Change-Id: I63d3205ef8656a2cd2c0d855a25e712ad66e2429
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

0 files changed, 0 insertions, 0 deletions