readjust the plan reading window to match the size of the plan

[paulheider]

There seems to be a lag between the label size and the needed space to show the full plan. Immediate calls to plan.texture_update() don't always reveal the actual required size needed to see the full plan. Overfull labels cut off the plan. Underfull labels show a line of weird characters at the end of the plan.

[paulheider]

Fixed.