Sorry for a very late answer. Yes, this was considered. Neither Cocotron or GNUstep GUI frameworks are really fit for the purpose.
The current idea is to reimplement the whole graphical stack from bottom to top, starting with CALayers.
Luboš
Dne středa 2. září 2015 1:48:04 UTC+2 Demetrius Iatrakis napsal(a):