Reuqirements:
1. Visibility On/Off icons are too difficult to distinguish. Probably, color-code that somehow?
1. Visibility icon should be separated from the rest of the icons set, for not to mix it.
1. If a parent of a layer is not visible, it should be easily seen. So the layer should have three states: visible, invisible (because of the parent), invisible (direclty).
1. Also note the visualization of Isolate Layer mode, atm it grays out all the layers except isolated one.
1. Color coding for layers:
* assign color tags to layer (should we support multiple color tags? (DK: guess not))
* filter layers by color tag
* zero-overhead principle: the filtering stuff should not occupy space when not used (hide'able, or something like that)
1. A concept from the forum discussion: http://imgur.com/X1RvoKn
1. Another concept: http://i.imgur.com/O3P8u0z.png
1. In detailed view the scale of the icons should be bigger to click easier
1. Ability to delete the layer when it is invisible. What other actions should be possible? Painting?
1. Inherit alpha and Lock alpha icons are not easily understandable ([[ https://forum.kde.org/viewtopic.php?f=288&t=123326#p325950 | link ]])
1. One more mockup: http://postimg.org/image/ec8c72hvx/
1.