Future ideas for the widget

[actionless]

(copied from BlingCorp/bling#64)

1. option to display tag indices and/or names
   1.1) mb index to show at the corner at top level
   1.2) and name only on empty tags on the background

2. dynamic tagging features:
   3.1) add/remove tag
   3.2) "protect" first N tag indices from being removed

3. adding signals when widget opened (and removing them then it is closed) to update tag previews when new client get opened, resized, layout changed, etc

4. if client have portrait aspect ratio, display icon on top of the text, not on the left as for album-oriented clients

5. [not interested myself but someone could find useful] drag-n-dropping clients from tag to tag

6. [not interested myself but someone could find useful] keyboard navigation same as in Revelation

7. (?) btw, subscribing to client.name and client.icon changes would allow to recreate Windows™ 8™ Tiles™ but the right way :D