matTooltip does not reliably disappear when closing matSelect with ESC

[chadfranzen]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

If a mat-option inside a mat-select panel has a matTooltip applied to it, and the tooltip is being shown, closing the mat-select should cause that tooltip to disappear.

What is the current behavior?

If the select panel is closed using the ESC key, and the mouse does not move during closing, the tooltip can remain onscreen until the user clicks elsewhere.

What are the steps to reproduce?

StackBlitz: https://stackblitz.com/edit/angular-1paubu

1. Open the select panel and select one of the options
2. Open the panel again, hover over an option so that the tooltip appears
3. Press the ESC key to close the panel. Don't move the mouse while it is closing
4. The tooltip should still be visible after the panel has closed. It will remain visible until you click somewhere else.

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

Angular Material 7.1.0