minmax fails if new min == old max

[d-lamb]

If I have some scenario like this:

($old_min,$old_max)=$plot->x->minmax;
$dx = $old_max - $old_min;
$new_max = $old_max + $dx;
$new_min = $old_max;
$plot->x->minmax($new_min,$new_max);`

it will fail because the minmax setter calls _min, then _max. _min has the line if ($self->max == $new_value), which is true in the moment, so $self->{minValue} = $new_value; never happens.

I thought that just switching _min and _max in minmax would work, but not for the case where new max == old min. So maybe in minmax you want to call the _min, _max pair twice? Doesn't look like it would introduce too much overhead. I couldn't quickly think of any logic to easily change _min, but haven't spent too much time on it.

I got around it for now buy having

$new_min = $old_max +1;

[run4flat]

This needs to be fixed, but I'll have to think about just how to fix it. One thing would be to check if either the $new_max == $old_min or $new_min == $old_max in minmax.