[design] [Dialogs] shutdown menu should show icons

[James Hunt]

Holding the physical power button displays the shutdown menu with options to shutdown, restart or cancel. These buttons are colour-coded but for added clarity I think we should add icons to represent the operations.

Note that if this menu is changed, there are other parts of the system that also offer similar shutdown/restart menus (see bug 1377145) so ideally they would also be modified (or even better they would make use of the "one true" shutdown menu to avoid inconsistency).

[James Hunt (jamesodhunt)]

Rationale for adding icons:

1) The standard shutdown (power) icon, and the restart (circular arrow) are almost universally recognised (to the extent that you wonder if we could actually remove the text).

2) Colours only work if you can discriminate between then. Red and green are alas an unfortunate combination (http://en.wikipedia.org/wiki/Color_blindness#Red.E2.80.93green_color_blindness)

3) if you inadvertently change your language to a language you don't actually understand, you have a hope of selecting the correct option if you can recognise the icon :-)

[kevin gunn (kgunn72)]

adding ubuntu-ux so our design team can weigh in.

[Matthew Paul Thomas (mpt)]

Thanks for the suggestion. This would make the buttons in this dialog inconsistent with every other dialog on the system. That isn't *necessarily* a bad thing -- the dialog does something more startling than most other dialogs on the system. But when visual design is used to indicate that, it's typically done by changing the design of the entire dialog (as in Windows, and Unity 7), not just the buttons.

Anyway, the particular problem here of distinguishing Restart vs. Power Off we are instead going to solve by removing the Restart button (bug 1436458).