match windows without class
Is it possible to use a WM_CLASS test to match windows without a class? The reason I ask is the following match only matches windows that have a WM_CLASS set, the others are ignored:
assign [class="^(?!Steam)" title="(StarConflict.*|Trine|Spiral.*|Iesabel|The Witcher.*|Teslagrad.*|Dust:.*|Bastion|Painkiller.*|RaceTheSun|Rochard)"] $ws9
This matches, for instance, The Witcher 2 Launcher which has a WM_CLASS
property:
xprop output
but not, for instance, Teslagrad, which does not: xprop output
I don't have anything to test with, but maybe `[class="^$"]` matches (it matches empty strings, I'm not sure how missing properties are mapped).