Choice grid has no overflow when combined with other task with sidebar

Summary

When a choice task that chooses from a grid is combined with another task using a sidebar, there is no scrollbar to scroll the choice grid body. Instead, the body takes up as much space as needed and the task grows accordingly.

Steps to reproduce

import StdEnv
import iTasks

Start w = doTasks task w

task = ArrangeWithSideBar 1 RightSide True @>> (
		enterChoice [ChooseFromGrid id] [1..100] >&^
		viewSharedInformation []
	)

What is the current bug behavior?

There is a scrollbar on the whole page, but not on the choice grid body itself.

Adding ScrollContent on the enterChoice task has no effect.

What is the expected correct behavior?

The scrollbar should be on the choice grid (it should be possible to scroll the grid without losing the right task from view).

Relevant logs, screenshots, ...

The behaviour of the MWE above:

For comparison, the enterChoice task as the only task (note that the body has its own scrollbar):

Possible fixes