[gitg] Avoid parse html tags from commits

[Alberto Fanjul <albfan src gnome org>]

commit 8553d941ecaa6dd09573bdeb3db8c717f2567416
Author: Alberto Fanjul <albertofanjul gmail com>
Date:   Sat Jan 22 13:46:22 2022 +0100

    Avoid parse html tags from commits

 libgitg/gitg-diff-view-commit-details.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libgitg/gitg-diff-view-commit-details.vala b/libgitg/gitg-diff-view-commit-details.vala
index 19d15eb3..9ac9ff66 100644
--- a/libgitg/gitg-diff-view-commit-details.vala
+++ b/libgitg/gitg-diff-view-commit-details.vala
@@ -187,7 +187,7 @@ class Gitg.DiffViewCommitDetails : Gtk.Grid
                        return;
                }
 
-               d_label_subject.set_markup(subject_to_markup(commit.get_subject()));
+               d_label_subject.set_markup(subject_to_markup(Markup.escape_text(commit.get_subject())));
                d_label_sha1.label = commit.get_id().to_string();
 
                var author = commit.get_author();