As Cheesequake noted in !1673, there may be cases where one would want
to run gimp_help_connect() while also setting a tooltip. So they also
run gimp_help_set_help_data(), even though the latter is implied by the
former. Worse, it makes the order matter too much because if you call
gimp_help_connect() after gimp_help_set_help_data(), the tooltip would
be removed.
Now the reason is that gimp_help_connect() was clearly made to be run on
windows whereas gimp_help_set_help_data() was for other widgets, which
usually don't need to react to F1. Yet the previous commit does add
F1-connect for the lock buttons, which kind of makes sense. So why not
just add this tooltip argument.
As a side fix, I am removing a bunch of gimp_help_connect() on each
button in the layers effect popover. Just run it once on the top
container.