demos which uses patch/legend fails after cset df972b9d080a

[Andreas Weber]

Dear Pantxo, since changeset

Änderung:        18901:df972b9d080a
Nutzer:          Pantxo Diribarne <address@hidden>
Datum:           Sat Jun 21 13:07:57 2014 +0200
Zusammenfassung: Translate patch property listeners to C++ (bug #42159)

these demos fails with A(I,J): row index out of bounds; value 2 out of
bound 1 or A(I,J): column index out of bounds; value 3 out of bound 2

area 1
copyobj 2
legend 18
legend 19
legend 35
pie3 1
pie3 2
pie3 3
ribbon 1

for example:
octave:1> demo area 1
area example 1:
 ## Verify identity sin^2 + cos^2 = 1
 clf;
 t = linspace (0, 2*pi, 100)';
 y = [sin(t).^2, cos(t).^2];
 area (t, y);
 axis tight
 legend ('sin^2', 'cos^2', 'location', 'NorthEastOutside');
 title ('area() plot');

area example 1: failed
A(I,J): row index out of bounds; value 2 out of bound 1

-- Andy