[LyX/master] Fix bug #11552

[Enrico Forestieri]

commit f2029fb38621803923e28bf8a6b8e45e4e32670d
Author: Enrico Forestieri <for...@lyx.org>
Date:   Wed Apr 17 16:03:13 2019 +0200

    Fix bug #11552
    
    Do not insert a brace inset when we know that LyX wrote the braces.
    
    This commit amends [503f7db2/lyxgit].
---
 src/mathed/MathParser.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/mathed/MathParser.cpp b/src/mathed/MathParser.cpp
index 436f022..f0d1d7c 100644
--- a/src/mathed/MathParser.cpp
+++ b/src/mathed/MathParser.cpp
@@ -946,7 +946,7 @@ bool Parser::parse1(InsetMathGrid & grid, unsigned flags,
                        parse(ar, FLAG_BRACE_LAST, mode);
                        // do not create a BraceInset if they were written by 
LyX
                        // this helps to keep the annoyance of  "a choose b"  
to a minimum
-                       if (ar.size() == 1 && ar[0]->extraBraces())
+                       if (ar.size() == 1 && (ar[0]->extraBraces() || 
ar[0]->asBraceInset()))
                                cell->append(ar);
                        else
                                cell->push_back(MathAtom(new 
InsetMathBrace(ar)));