It's supposed to indicate a thread never expires, but following
a change where it stores the expiry with chrono we no longer considered
a negative expiry as 'forever', but rather it immediately expires!
More directly it is because we end up calling
QDeadlineTimer::setPreciseRemainingTime(0 secs, X nsecs), and it only
cares about negative seconds to set Forever. There are complications to
consider nsecs for this since several nanoseconds may pass between
initially calling the function and assigning the values...
Amends 1f2a230b89.
Fixes: QTBUG-129898
Change-Id: I9626de31810fb2751ff6d83165d7dce5258a9baf
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit c57027199996d0f0d2ac8ebc4505c78afa54ab5a)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
d6c592aa2f