backport: fix trace.py --ignore-dir

Lib/trace.py

@@ -587,7 +587,7 @@ class Trace:
         """
         if why == 'call':
             code = frame.f_code
-            filename = code.co_filename
+            filename = frame.f_globals.get('__file__', None)
             if filename:
                 # XXX modname() doesn't work right for packages, so
                 # the ignore support won't work right for packages

Misc/NEWS

@@ -169,6 +169,9 @@ Extension Modules
 Library
 -------
 
+- Patch 1571379: Make trace's --ignore-dir facility work in the face of
+  relative directory names.
+
 - Bug #1600860: Search for shared python library in LIBDIR, not lib/python/config,
   on "linux" and "gnu" systems.