Tooltip does not react on changes of tooltipClass

[joergplewe]

Bug description:

When changing tooltipClass programatically while tooltip is open, it does not reflect the change.

Link to minimally-working StackBlitz that reproduces the issue:

https://stackblitz.com/edit/angular-3azkna

Versions of Angular, ng-bootstrap and Bootstrap:

Angular:
8.2.3

ng-bootstrap:
5.0.0

Bootstrap:
4

[joergplewe]

I found a workaround, doing a close()/open() in a setTimeout():

https://stackblitz.com/edit/angular-3azkna-rbbglf

  toggleError() {
    this.isError = !this.isError;
    setTimeout( () => {
      if ( this.tooltip.isOpen() ) {
        this.tooltip.close();
        this.tooltip.open();
      }
    }, 0);
  }

[peterblazejewicz]

@joergplewe
Covered by #3380