It's not possible to reliably stage things into a custom patch when "ignore
whitespace" is on, so always treat it as off here (like we do in the staging
panel).
It looks like this is a regression that was introduced in 8edad826ca.
This begins a big refactor of moving more code out of the Gui struct into contexts, controllers, and helpers. We also move some code into structs in the
gui package purely for the sake of better encapsulation
