Keep menubar icon highlighted when popup is visible

[xhacker]

The highlight state should be kept after click on the icon.

Some clue: https://code.google.com/p/chromium/issues/detail?id=402787

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[luin]

+1 for this enhancement. The current behaviour seems to be a little strange IMO.

[luin]

Awesome! Me-me-da!

[xhacker]

Reopening because the approach no longer works on El Capitan.