Hull of multmatrix

[KeithSloan]

The following file fails

hull() {
	multmatrix([[0, 0, 1, 0], [1, 0, 0, 0], [0, 1, 0, 0], [0, 0, 0, 1]]) {
		multmatrix([[1, 0, 0, -75], [0, 1, 0, 26.5], [0, 0, 1, -31], [0, 0, 0, 1]]) {
			group() {
				multmatrix([[1, 0, 0, -23], [0, 1, 0, -3.5], [0, 0, 1, 0], [0, 0, 0, 1]]) {
					cube(size = [46, 7, 1], center = false);
				}
			}
		}
		multmatrix([[1, 0, 0, -60], [0, 1, 0, 21.5], [0, 0, 1, 993], [0, 0, 0, 1]]) {
			group() {
				multmatrix([[1, 0, 0, -18], [0, 1, 0, -3.5], [0, 0, 1, 0], [0, 0, 0, 1]]) {
					cube(size = [36, 7, 1], center = false);
				}
			}
		}
	}
}

The problem is that the multmatrix performs a fuse if it contains more than one object, the result in the above example is that
hull request only finds one object on the stack.

Look at changing multmatrix which find more than one object not to fuse before application but to apply the multmatrix to each item