notmuch-mutt: replace extra command with notmuch thread search feature

This should be be slightly faster since it avoids forking a shell
and is less code in and less dependencies for the script.

Since String::ShellQuote isn't used elsewhere, drop mention of it.

contrib/notmuch-mutt/README

@@ -39,8 +39,6 @@ To *run* notmuch-mutt you will need Perl with the following libraries:
   (Debian package: libmail-box-perl)
 - Mail::Header <https://metacpan.org/pod/Mail::Header>
   (Debian package: libmailtools-perl)
-- String::ShellQuote <https://metacpan.org/pod/String::ShellQuote>
-  (Debian package: libstring-shellquote-perl)
 - Term::ReadLine::Gnu <https://metacpan.org/pod/Term::ReadLine::Gnu>
   (Debian package: libterm-readline-gnu-perl)
 

contrib/notmuch-mutt/notmuch-mutt

@@ -17,7 +17,6 @@ use Getopt::Long qw(:config no_getopt_compat);
 use Mail::Header;
 use Mail::Box::Maildir;
 use Pod::Usage;
-use String::ShellQuote;
 use Term::ReadLine;
 use Digest::SHA;
 
@@ -126,13 +125,9 @@ sub thread_action($$@) {
     }
 
     $mid =~ s/ //g; # notmuch strips spaces before storing Message-Id
-    $mid =~ s/"/""/g; # escape all double quote characters
+    $mid =~ s/"/""""/g; # escape all double quote characters twice
 
-    my $search_cmd = 'notmuch search --output=threads ' . shell_quote(qq{id:"$mid"});
+    search($results_dir, $remove_dups, qq{thread:"{id:""$mid""}"});
-    my $tid = `$search_cmd`;	# get thread id
-    chomp($tid);
-
-    search($results_dir, $remove_dups, $tid);
 }
 
 sub tag_action(@) {

debian/control

@@ -227,7 +227,6 @@ Architecture: all
 Depends:
  libmail-box-perl,
  libmailtools-perl,
- libstring-shellquote-perl,
  libterm-readline-gnu-perl,
  notmuch (>= 0.4),
  ${misc:Depends},