Unable to set divisor or offset in Convolution Matrix dialog
GIMP 2.10.6 on Arch Linux (gimp-2.10.6-2)
All controls in the dialog are active and work as expected except the Divisor and Offset. Clicking on the arrows won't increment or decrement. Direct entry of a value is impossible.
In the dialog screenshot, I want to set the divisor to 22, but I cannot change it from the default of 1.0.
(Unrelated note: I like the addition of presets to this filter!)