In QWinTimeZonePrivate::previousTransition(), an initial no-transition
first rule was interpreted as implying a transition to its standard
time at "the start of time". Do the same for times before the start of
the first rule even if it is a DST recurrence; and, in data(), treat
times before the first rule as being in its standard time.
In the process, restructure data() to do that early return first,
instead of in an else clause, so as to dedent the other branch of its
code and make clearer how it fits into its outer loop.
Pick-to: 6.3
Change-Id: I21482d904c33542bf04f6510b974c01817d7aa5f
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
8bf0fbca70