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/mercurial/filemerge.py	Thu Nov 07 03:59:22 2019 -0800
+++ b/mercurial/filemerge.py	Thu Nov 07 13:18:19 2019 -0500
@@ -934,10 +934,10 @@
             name = os.path.join(tmproot, pre)
             if ext:
                 name += ext
-            f = open(name, r"wb")
+            f = open(name, "wb")
         else:
             fd, name = pycompat.mkstemp(prefix=pre + b'.', suffix=ext)
-            f = os.fdopen(fd, r"wb")
+            f = os.fdopen(fd, "wb")
         return f, name
 
     def tempfromcontext(prefix, ctx):