It is straight-forward to use the unroll environment. However, what’s not is deleting it. For example, let’s say I have a normal itemize environment and I apply to it the unroll environment. Now, let’s say I’ve changed my mind and want it removed. The way I expect it to work is make sure that the unroll environment is selected and then hit ctrl+backspace. The unroll environment goes away, but takes away with it all the text except the first item of the itemize environment, which is not supposed to happen.
How to delete an unroll environment?
I guess its safe to assume that this is not possible.
Well, it has not be programmed, (yet). You need to write a macro which flattens the various arguments of the unroll and then deletes it.
You might want to give a look at progs/dynamic/fold-edit.scm