[LyX/master] Revert "InsetFootlike.cpp: disable listings inside footnotes"

[Scott Kostyshak]

commit 6631e736bd3c2a479e28d584e25bd38d2e0451c7
Author: Scott Kostyshak <skost...@lyx.org>
Date:   Sun Dec 6 22:43:36 2015 -0500

    Revert "InsetFootlike.cpp: disable listings inside footnotes"
    
    Although af8ba5e0 fixed #9321, it broke a valid use case that was
    reported by a user at #9785. Hopefully we can come up with a better
    fix for #9321.
    
    This reverts commit af8ba5e0696c0e1989effe4179c990a054bc06df.

diff --git a/src/insets/InsetFootlike.cpp b/src/insets/InsetFootlike.cpp
index cb92320..5685e86 100644
--- a/src/insets/InsetFootlike.cpp
+++ b/src/insets/InsetFootlike.cpp
@@ -61,8 +61,7 @@ void InsetFootlike::write(ostream & os) const
 
 bool InsetFootlike::insetAllowed(InsetCode code) const
 {
-       if (code == FOOT_CODE || code == MARGIN_CODE || code == FLOAT_CODE
-               || code == LISTINGS_CODE)
+       if (code == FOOT_CODE || code == MARGIN_CODE || code == FLOAT_CODE)
                return false;
        return InsetCollapsable::insetAllowed(code);
 }