While it would be perverse for availableTimeZoneIds() to list all
supported UTC-offset zone IDs, it makes reasonably good sense for its
offset-specific overload to include the ID QTimeZone would use for the
relevant UTC-offset, since passing this ID to the ID-based constructor
will indeed get a zone with this offset. In particular, it already
does include the offset-zone's ID if there is an IANA UTC-offset zone
with the given offset; and its list is apt to be empty otherwise.
Only applies to IDs we would in fact accept, checked with
offsetFromUtcString() to match the QTZ constructor's check.
Change-Id: I77bb60b166c3d3af5824d84952e1e10a5d32a5ad
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
905fb43594