Comment # 1 on bug 91461 from Daniel Scharrer

Created attachment 117373 [details]
Tessellation test case

I have attached a test case for this. It can be compiled and run using:
 $ sh tessellation.cpp

Use the arrow keys to change which TCS invocation writes to gl_TessLevel* (or
use space/enter to toggle between the first and the last).

It should display a yellow grid no matter what TCS invocation is selected but
instead displays a green grid for invocation 3 and nothing for all other
invocations.