MatSelectionList exposes SelectionModel, but does not respond to changes

[simeyla]

Bug, feature request, or proposal:

MatSelectionList publically exposes its selection model, but if you try to select an item from the outside it does not update the UI.

What is the expected behavior?

If I call matSelectionList.selectedOptions.select(option) with an existing option I expect that option to become checked in the UI.

OR the exposed selection model should be some kind of new read-only model. Or at the very least documented as being effectively read-only.

What is the current behavior?

It is not checked. Looking at the source it's obvious why - it doesn't call any change handler.

What are the steps to reproduce?

This sample listens to selection change events and atempts to deselect all items in a selection list before reselecting the one you just clicked (i.e. to simulate a single selection list). If you call MatListOption.selected=true then it does get updated - but if you call selectedOptions.select(option) it doesn't.

https://angular-i3pfu2-f3hkj5.stackblitz.io

What is the use-case or motivation for changing an existing behavior?

Confusing. I expect to be able to set an option in the selection model

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

5.2.4 / 5.2.0

Is there anything else we should know?

This particular example was to achieve a single selection model which SelectionModel does natively support, so I don't know why this control doesn't do it.

The ability to select by value seems to be missing too.

Also the ability to hide the checkbox would be nice and show a highlighted background instead.

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