[geometry-1] discrepancy: setting a matrix to identity with setters keeps is2D true. Creating a matrix with an identity sequence sets is2D to false. #588
Description
There's a discrepancy:
This,
const mat = new DOMMatrix()
toIdentity(mat)
console.log(mat.is2D) // "true"
function toIdentity(mat) {
mat.m11 = 1
mat.m12 = 0
mat.m13 = 0
mat.m14 = 0
mat.m21 = 0
mat.m22 = 1
mat.m23 = 0
mat.m24 = 0
mat.m31 = 0
mat.m32 = 0
mat.m33 = 1
mat.m34 = 0
mat.m41 = 0
mat.m42 = 0
mat.m43 = 0
mat.m44 = 1
}is essentially the same as the following,
const mat = new DOMMatrix([
1, 0, 0, 0,
0, 1 ,0, 0,
0, 0, 1, 0,
0, 0, 0, 1
])
console.log(mat.is2D) // "false"except is2D is false instead of true in the second one.
I believe that if a matrix is set back to identity in any way, is2D should return true.
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