Fix printing multi canvas of victor layers

[aziz-access]

What is the current behavior? (You can also link to an open issue here)

Fix printing multi canvas of victor layers

Does this PR introduce a breaking change? (check one with "x")

• Yes
• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications:

Other information:

[alecarn]

Pour la lisibilité, ça serait bien d'isoler ce code dans une méthode.

Suggested change

	for (let index = 0; index < mapCanvas.length; index++) {
	const canvas = mapCanvas[index];
	if (canvas.width > 0) {
	const opacity = canvas.parentElement.style.opacity || canvas.style.opacity;
	mapContextResult.globalAlpha = opacity === '' ? 1 : Number(opacity);
	const transform = canvas.style.transform;
	let matrix: number[];
	if (transform) {
	// Get the transform parameters from the style's transform matrix
	matrix = transform
	.match(/^matrix\(([^\(]*)\)$/)[1]
	.split(',')
	.map(Number);
	} else {
	matrix = [
	parseFloat(canvas.style.width) / canvas.width,
	0,
	0,
	parseFloat(canvas.style.height) / canvas.height,
	0,
	0,
	];
	}
	CanvasRenderingContext2D.prototype.setTransform.apply(
	mapContextResult,
	matrix
	);
	const backgroundColor = canvas.parentElement.style.backgroundColor;
	if (backgroundColor) {
	mapContextResult.fillStyle = backgroundColor;
	mapContextResult.fillRect(0, 0, canvas.width, canvas.height);
	}
	mapContextResult.drawImage(canvas, 0, 0);
	mapContextResult.globalAlpha = 1;
	// reset canvas transform to initial
	mapContextResult.setTransform(1, 0, 0, 1, 0, 0);
	}
	}
	for (let index = 0; index < mapCanvas.length; index++) {
	const canvas = mapCanvas[index];
	if (canvas.width > 0) {
	this.handleCanvas(...)
	}
	}