Brightness/Contrast min/max fields are not respected

[ctrueden]

Create a black float image 1000 x 1000
Run Process > Math Equation
Use this data for input to dialog: y, (x + y) / 1000
This makes a ramp 0 to 2 by thousandths
Now open B&C and set min to 0.001 and max to 0.008
Tabbing out of the fields will not use entered values but some calculated values instead.

This ticket based on an email from Michael Schmid

Migrated-From: http://trac.imagej.net/ticket/1809