cprotect listings when needed (e.g. in a footnote)

This allows to put a non-inline listing in commands, such as a box,
footnote, and margin note.

Fixes #6177 and #9321.

diff --git a/lib/layouts/stdinsets.inc b/lib/layouts/stdinsets.inc
index 5aca78800623e37067d1b2d2f7a090e8cf1b1a88..fc54ac80eb562f76ba93486c39ae33f23bce62ab 100644 (file)
--- a/lib/layouts/stdinsets.inc
+++ b/lib/layouts/stdinsets.inc
@@ -361,6 +361,7 @@ InsetLayout Listings
        KeepEmpty             true
        FreeSpacing           true
        ForceLTR              true
+       NeedCProtect          true
        RefPrefix             lst
        HTMLTag               pre
        HTMLStyle