MdTooltip : toolTip reappears after opening and closing a dialog

[JDillon522]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Mouseover a button and the tooltip appears.
Click the button and it opens a dialog, tooltip disappears.
Close the dialog and there shouldn't be a tooltip.

What is the current behavior?

Mouseover a button and the tooltip appears.
Click the button and it opens a dialog, tooltip disappears.
Close the dialog and the tooltip reappears.

What are the steps to reproduce?

Plunker: https://plnkr.co/edit/HtKDFQ?p=preview

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

If I click a button with a tooltip attached it should close the tooltip automatically. I obviously have no need of the extra information given by the tooltip.

[willshowell]

Should be fixed by #7258, but maybe @crisbeto can verify.

[crisbeto]

Closing as a duplicate of #7245.

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