[isabelle-dev] NEWS: improved scheduling for urgent print tasks

[Makarius]

*** Prover IDE -- Isabelle/Scala/jEdit ***

* Improved scheduling for urgent print tasks (e.g. command state output,
interactive queries) wrt. long-running background tasks.


This refers to Isabelle/f52b4b0c10c4. The change actually turned out quite 
simple.

Once again, the interactive behaviour needs to be tested carefully in 
practice.  There is also a slight bias for hyperthreaded CPUs here.


 	Makarius