[LyX/2.1.x] Fix issue with CAS.

[Enrico Forestieri]

commit 564447057640dbf63e4368fde8efc523c3132703
Author: Enrico Forestieri <for...@lyx.org>
Date:   Sun Nov 9 21:33:53 2014 +0100

    Fix issue with CAS.
    
    See http://thread.gmane.org/gmane.editors.lyx.devel/153516
    This regression was due to a thinko in [43f6b167/lyxgit].

diff --git a/src/mathed/InsetMathHull.cpp b/src/mathed/InsetMathHull.cpp
index daf43fe..9657475 100644
--- a/src/mathed/InsetMathHull.cpp
+++ b/src/mathed/InsetMathHull.cpp
@@ -1346,7 +1346,7 @@ void InsetMathHull::doExtern(Cursor & cur, FuncRequest & 
func)
                MathData ar;
                if (cur.inMathed() && cur.selection()) {
                        asArray(grabAndEraseSelection(cur), ar);
-               } else if (!pos == cur.cell().empty()) {
+               } else if (pos == cur.cell().size()) {
                        ar = cur.cell();
                        lyxerr << "use whole cell: " << ar << endl;
                } else {
diff --git a/status.21x b/status.21x
index c38e3b4..36f2469 100644
--- a/status.21x
+++ b/status.21x
@@ -96,6 +96,8 @@ What's new
 
 - Disallow to insert program listings to footnotes and margin notes (bug 9321).
 
+- Fix computer algebra system computations in formulas with '=' signs.
+
 
 * INTERNALS