cleanup: remove pointless r-prefixes on double-quoted strings This is only double-quoted strings. I'll do single-quoted strings as a second step. These had existed because our source transformer didn't turn r"" into b"", so we had tagged some strings as r-strings to get "native" strings on both Pythons. Now that the transformer is gone, we can dispense with this nonsense. Methodology: I ran hg locate 'set:added() or modified() or clean()' | egrep '.*\.py$' | xargs egrep --color=never -n -- \[\^a-z\]r\"\[\^\"\\\\\]\*\"\[\^\"\] in an emacs grep-mode buffer, and then used a keyboard macro to iterate over the results and remove the r prefix as needed. # skip-blame removing unneeded r prefixes left over from Python 3 migration. Differential Revision: https://phab.mercurial-scm.org/D7305

--- a/contrib/perf.py	Thu Nov 07 03:59:22 2019 -0800
+++ b/contrib/perf.py	Thu Nov 07 13:18:19 2019 -0500
@@ -1658,7 +1658,7 @@
             )
         else:
             os.environ[r'HGRCPATH'] = r' '
-            os.system(r"%s version -q > NUL" % sys.argv[0])
+            os.system("%s version -q > NUL" % sys.argv[0])
 
     timer(d)
     fm.end()