[LyX/master] Fix CAS computation of a selected subformula.

commit 29cebc7fb0bb3ab5acf2759ff4b964657ad59495 Author: Enrico Forestieri for...@lyx.org Date: Sun Nov 9 21:56:40 2014 +0100 Fix CAS computation of a selected subformula. Invoking a computer algebra system program for computing a selected subformula has never worked (checked

[LyX/master] Fix CAS computation of a selected subformula.

commit 29cebc7fb0bb3ab5acf2759ff4b964657ad59495 Author: Enrico Forestieri Date: Sun Nov 9 21:56:40 2014 +0100 Fix CAS computation of a selected subformula. Invoking a computer algebra system program for computing a selected subformula has never worked (checked