fix: Fix `Backlinks` not applying the display class (#519)

Luca Salvarani

2023-10-02 c8f5dbbad3a85749d8a74f5e3e3b222fe547d5d6

 quartz/plugins/transformers/frontmatter.ts

@@ -37,6 +37,11 @@
              data.tags = data.tag
            }

            // coerce title to string
            if (data.title) {
              data.title = data.title.toString()
            }

            if (data.tags && !Array.isArray(data.tags)) {
              data.tags = data.tags
                .toString()