CdkPortalOutlet attachComponentPortal not render portal to outlet when portal have viewContainerRef

[keatkeat87]

actually, I m not 100% confirm this is a bug or is by design. because document not very clear for this part.

Reproduction

https://github.com/keatkeat87/ng-mat-portal-outlet-issue

Expected Behavior

the portal should render in outlet not view container.

Actual Behavior

the portal render in view container.

more details:
I check the source code, class CdkPortalOutlet

as the comment said that
// If the portal specifies an origin, use that as the logical location of the component
// in the application tree. Otherwise use the location of this PortalOutlet.
if i not wrong, logical location is not equal to render location, so in this part, should have some code to move the element to outlet location.
i think it should work same as DomPortalOutlet

in the end, move element to outlet.
another interesting thing is in class CdkPortalOutlet
when we attach a templatePortal, it just ignore the templatePortal viewContainerRef.

it work not same as attach a component portal. it really make user confusing.

Environment

• Angular: 9.0.0 rc1
• CDK/Material: 9.0.0 rc 0
• Browser(s): chrome latest
• Operating System (e.g. Windows, macOS, Ubuntu): windows 10

[crisbeto]

You're correct, this is defininitely a bug. We probably hadn't noticed it until now because we either don't pass in a different ViewContainerRef or we use the DomPortalOutlet which doesn't have this issue. Should be fixed in #17731.

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