getpriority() and top display for priority inconsistent

[Lavrentiev, Anton (NIH/NLM/NCBI) [C] via cygwin]

> Feel free to provide a patch, just, please, create a valid git commit message

"getpriority() consistent with process priority https://cygwin.com/ml/cygwin/2019-08/msg00122.html"

The changeset is really trivial:

diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index a914ae8..20126ce 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -3977,7 +3977,12 @@ getpriority (int which, id_t who)
       if (!who)
        who = myself->pid;
       if ((pid_t) who == myself->pid)
-       return myself->nice;
+        {
+          DWORD winprio = GetPriorityClass(GetCurrentProcess());
+          if (winprio != nice_to_winprio(myself->nice))
+            myself->nice = winprio_to_nice(winprio);
+          return myself->nice;
+        }
       break;
     case PRIO_PGRP:
       if (!who)

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