[O] clock-in task is not highlighted in agenda view

[Liang Wang]

Hi,

When I press 'I' to clock-in task in agenda view, the line of that
task is not highlighted any more.  After git bisect, I find that this
problem occurs since commit d43f7eb org-agenda.el: Make sure to get a
property from (1- (point-max)), not (point-max)).

After I refresh the agenda view, the line is highlighted.

Thanks,
Liang