Make PyTraceBack_Here use the current thread, not the
frame's thread state. Fixes #1579370.
Will backport.
diff --git a/Misc/NEWS b/Misc/NEWS
index 5c3f48d..65b0672 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
 Core and builtins
 -----------------
 
+- Bug #1579370: Make PyTraceBack_Here use the current thread, not the
+  frame's thread state.
+
 - patch #1630975: Fix crash when replacing sys.stdout in sitecustomize.py
 
 - Patch #1507247: tarfile.py: use current umask for intermediate