Return a reference, not a copy.

Stupid mistake from 2009. Thanks to Scott and JMarc for tracking
it down.

(cherry picked from commit de5f63eeb398046027180162272cc83099fdef55)

diff --git a/src/insets/InsetLayout.h b/src/insets/InsetLayout.h
index 6700100252a24b3996938b5d5359c1ad4f407b18..7593d844d52637af1b3da7406199316f99be296c 100644 (file)
--- a/src/insets/InsetLayout.h
+++ b/src/insets/InsetLayout.h
@@ -200,7 +200,7 @@ public:
        ///
        bool docbookrenderasimage() const { return docbookrenderasimage_; }
        ///
-       std::set<std::string> required() const { return required_; }
+       std::set<std::string> required() const & { return required_; }
        ///
        bool isMultiPar() const { return multipar_; }
        ///