viewdiff: escape '{' and '}' for regexp

Perl 5 doesn't warn on this, yet, but it warns on unescaped
'(' and ')' nowadays, so it's conceivable Perl could start
warning on this in the future.  So future-proof our code and
reduce reader confusion.

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/PublicInbox/ViewDiff.pm b/lib/PublicInbox/ViewDiff.pm
index 05acc242..f492b697 100644
--- a/lib/PublicInbox/ViewDiff.pm
+++ b/lib/PublicInbox/ViewDiff.pm
@@ -77,7 +77,7 @@ sub anchor0 ($$$$) {
         # which works well in practice. If projects put "=>", or trailing
         # spaces in filenames, oh well :P
         $fn =~ s/$DIFFSTAT_COMMENT//;
-        $fn =~ s/{(?:.+) => (.+)}/$1/ or $fn =~ s/.* => (.+)/$1/;
+        $fn =~ s/\{(?:.+) => (.+)\}/$1/ or $fn =~ s/.* => (.+)/$1/;
         $fn = git_unquote($fn);
 
         # long filenames will require us to check in anchor1()