[LyX/2.1.x] Phantom is fragile (#9456)

[Juergen Spitzmueller]

commit b7d21694137b4dba58618feb0f915031cab9f172
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Mon Mar 16 17:25:15 2015 +0100

    Phantom is fragile (#9456)

diff --git a/src/insets/InsetPhantom.cpp b/src/insets/InsetPhantom.cpp
index f7a9b45..a21a2c2 100644
--- a/src/insets/InsetPhantom.cpp
+++ b/src/insets/InsetPhantom.cpp
@@ -309,6 +309,8 @@ docstring InsetPhantom::toolTip(BufferView const &, int, 
int) const
 
 void InsetPhantom::latex(otexstream & os, OutputParams const & runparams) const
 {
+       if (runparams.moving_arg)
+               os << "\\protect";
        if (params_.type == InsetPhantomParams::Phantom)
                os << "\\phantom{";
        else if (params_.type == InsetPhantomParams::HPhantom)
diff --git a/status.21x b/status.21x
index bf36dc4..2ee6a30 100644
--- a/status.21x
+++ b/status.21x
@@ -69,6 +69,9 @@ What's new
 
 - Do not output \protect unnecessarily in subfigure contents (bug 9421).
 
+- Do \protect phantoms in fragile environments (such as captions)
+  (bug 9456).
+
 - Fix LaTeX error with font sizes in caption.
 
 - Fix wrong listings preamble encoding (bug 9382).