ps-table: Nested Mat-Menu's in Table-Actions do not work properly since 2.0.0-alpha.13

[schoenj]

Hi,

Mat-Menu's do not work properly together with the new Table-Action-System.
Every second level item closes itself immediatly after clicking on the parent.

Expected (v 2.0.0-alpha.12)

Actual (v 2.0.0-alpha.13)

Steps for reproduction

Add following code into *psTableRowAction and ensure that MatMenuModule is imported
<button mat-menu-item [matMenuTriggerFor]="myMenu"> My Test Action <mat-menu #myMenu="matMenu"> <button mat-menu-item> Nested 1 </button> <button mat-menu-item> Nested 2 </button> </mat-menu> </button>

[schoenj]

I think this issue cannot be solved because of limitations at the mat menu component (nesting mat-menus over multiple components are not possible). So we need to implement #177