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output: Remove duplicate layout lookup layouts

This can happen for sections if Type and Section are equal.

Of no real practical difference, but it makes the docs less confusing.

Fixes #4319

--- a/output/layout.go

+++ b/output/layout.go

@@ -17,6 +17,8 @@

 	"fmt"

 	"strings"

 	"sync"

+

+	"github.com/gohugoio/hugo/helpers"

 )

 // These may be used as content sections with potential conflicts. Avoid that.

@@ -95,6 +97,7 @@

 	}

 	layouts = prependTextPrefixIfNeeded(f, layouts...)

+	layouts = helpers.UniqueStrings(layouts)

 	l.mu.Lock()

 	l.cache[key] = layouts