MutableDependentCell<T> constructor
Construct a MutableDependentCell which depends on the cells in arguments
Every cell of which the value is referenced in compute must be
included in arguments.
If changesOnly is true, the returned cell only notifies its observers
if its value has actually changed.
If key is non-null it is used to identify the cell. NOTE, if key
is non null dispose has to be called, when the cell is no longer used.
Implementation
MutableDependentCell(this.arguments, {
this.changesOnly = false,
super.key
});