Avoid an infinite loop

When pasting "\big" without any following delimiter, avoid
processing the same token again and again. For unknown reasons,
the delim docstring turns out to always be not empty: even when
it simply contains a '0' (no delimiter follows), its length is 1.

Fixes bug #11027.

diff --git a/src/mathed/MathParser.cpp b/src/mathed/MathParser.cpp
index aaf8b229f89065c7925ac5c6cf38acceb151b950..112e62d1b2ed3164760dc91b52eb6703ab527eee 100644 (file)
--- a/src/mathed/MathParser.cpp
+++ b/src/mathed/MathParser.cpp
@@ -2000,7 +2000,10 @@ bool Parser::parse1(InsetMathGrid & grid, unsigned flags,
                                                        new InsetMathBig(t.cs(), delim)));
                                        else {
                                                cell->push_back(createInsetMath(t.cs(), buf));
-                                               putback();
+                                               // For some reason delim.empty()
+                                               // is always false here
+                                               if (delim.at(0))
+                                                       putback();
                                        }
                                }