Anyway this is how worked around the issue https://discourse.ubuntu.com/t/testing-unity-session-in-focal-fossa-20-04/13692/158 Basically I've removed the function unity::decoration::Window::Impl::ComputeShapedShadowQuad
Anyway this is how worked around the issue /discourse. ubuntu. com/t/testing- unity-session- in-focal- fossa-20- 04/13692/ 158 decoration: :Window: :Impl:: ComputeShapedSh adowQuad
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Basically I've removed the function unity::