gitweb: Finish restoring "blob" links in git_difftree_body

This finishes work started by commit 4777b0141a
  "gitweb: Restore object-named links in item lists"
by Petr Baudis. It brings back rest of "blob" links in difftree-raw
like part of "commit" and "commitdiff" views, namely in
git_difftree_body subroutine.

Now the td.link table cell has the following links:
 * link to diff ("blobdiff" view) in "commit" view, if applicable
   (there is no link to uninteresting creation/deletion diff), or
   link to patch anchor in "commitdiff" view.
 * link to current version of file ("blob" view), with the obvious
   exception of file deletion, where it is link to the parent
   version.
 * link to "blame" view, if it is enabled, and file was not just
   created (i.e. it has any history).
 * link to history of the file ("history" view), again with sole
   exception of the case of new file.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

gitweb/gitweb.perl

@@ -2092,7 +2092,11 @@ sub git_difftree_body {
 				# link to patch
 				$patchno++;
 				print $cgi->a({-href => "#patch$patchno"}, "patch");
+				print " | ";
 			}
+			print $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'},
+			                             hash_base=>$hash, file_name=>$diff{'file'})},
+			              "blob") . " | ";
 			print "</td>\n";
 
 		} elsif ($diff{'status'} eq "D") { # deleted
@@ -2114,9 +2118,7 @@ sub git_difftree_body {
 			                             hash_base=>$parent, file_name=>$diff{'file'})},
 			              "blob") . " | ";
 			if ($have_blame) {
-				print $cgi->a({-href =>
-						   href(action=>"blame",
-							hash_base=>$parent,
+				print $cgi->a({-href => href(action=>"blame", hash_base=>$parent,
 				                             file_name=>$diff{'file'})},
 				              "blame") . " | ";
 			}
@@ -2166,8 +2168,7 @@ sub git_difftree_body {
 			                             hash_base=>$hash, file_name=>$diff{'file'})},
 			               "blob") . " | ";
 			if ($have_blame) {
-				print $cgi->a({-href => href(action=>"blame",
-							     hash_base=>$hash,
+				print $cgi->a({-href => href(action=>"blame", hash_base=>$hash,
 				                             file_name=>$diff{'file'})},
 				              "blame") . " | ";
 			}
@@ -2208,17 +2209,16 @@ sub git_difftree_body {
 				              "diff") .
 				      " | ";
 			}
-			print $cgi->a({-href => href(action=>"blob", hash=>$diff{'from_id'},
-						     hash_base=>$parent, file_name=>$diff{'from_file'})},
+			print $cgi->a({-href => href(action=>"blob", hash=>$diff{'to_id'},
+			                             hash_base=>$parent, file_name=>$diff{'to_file'})},
 			              "blob") . " | ";
 			if ($have_blame) {
-				print $cgi->a({-href => href(action=>"blame",
-							     hash_base=>$hash,
+				print $cgi->a({-href => href(action=>"blame", hash_base=>$hash,
 				                             file_name=>$diff{'to_file'})},
 				              "blame") . " | ";
 			}
-			print $cgi->a({-href => href(action=>"history", hash_base=>$parent,
-			                            file_name=>$diff{'from_file'})},
+			print $cgi->a({-href => href(action=>"history", hash_base=>$hash,
+			                            file_name=>$diff{'to_file'})},
 			              "history");
 			print "</td>\n";