Windows previews or overview for all instances of app icon in plank

Registered by skypce on 2015-02-19

Will be great if you implement to plank an app windows overview, Like when you double click on app of ubuntu unity.
The idea is when double left click in a icon show the windows overview of all instances of selected icon app.
If you presss right click show the classic plank menu of items as we knows.
I am not developer but think that may be we need something like gala workspace overview but applied to plank and icons instead workspaces . Thank you in advance.

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skypce
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