InsetMathSubstack.cpp: fix #2498 also for branch

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/branches/BRANCH_1_6_X@37110 a592a061-630c-0410-9148-cb99ea01b6c8

src/mathed/InsetMathSubstack.cpp

@@ -73,6 +73,15 @@ bool InsetMathSubstack::getStatus(Cursor & cur, FuncRequest const & cmd,
 			flag.setEnabled(false);
 			return true;
 		}
+		// in contrary to \subaray, the columns in \substack
+		// are always centered and this cannot be changed
+		if (s == "align-left" || s == "align-right") {
+			flag.message(bformat(
+				from_utf8(N_("Can't change horizontal alignment in '%1$s'")),
+				from_utf8(name)));
+			flag.setEnabled(false);
+			return true;
+		}
 		return InsetMathGrid::getStatus(cur, cmd, flag);
 	}
 	default:

status.16x

@@ -170,6 +170,9 @@ What's new
 - Fix the response of the update button of the view source window
   after reopening a file (bug 5600).
 
+- Don't allow to set an alignment for rows in math substack environments
+  (bug 2498).
+
 
 * DOCUMENTATION AND LOCALIZATION