Filter out any duplicate files to post process

Updates #10269

diff --git a/hugolib/hugo_sites_build.go b/hugolib/hugo_sites_build.go
index 3bebc5284e1f763160493d139eb3e7536cad78e7..5eee564aaf319f0fc87cbd69128a88b825c752f1 100644 (file)
--- a/hugolib/hugo_sites_build.go
+++ b/hugolib/hugo_sites_build.go
@@ -438,7 +438,8 @@ func (h *HugoSites) postProcess() error {
                return nil
        }
 
-       for _, filename := range h.Deps.FilenameHasPostProcessPrefix {
+       filenames := helpers.UniqueStrings(h.Deps.FilenameHasPostProcessPrefix)
+       for _, filename := range filenames {
                filename := filename
                g.Run(func() error {
                        return handleFile(filename)