fix(axis): Fix for multi axes data bound

When data are bound to use different axis, it should maintain its axis domain value.

Ref #1233 (comment)

spec/internals/domain-spec.js

@@ -229,5 +229,32 @@ describe("DOMAIN", function() {
 			expect(yDomain).to.be.deep.equal(y2Domain);
 		});
 
+		it("set option data.axes", () => {
+			args.data.axes = {
+				data2: "y2"
+			};
+		});
+
+		describe("check the domain value after the data toggle", () => {
+			const checkDomain = (dataId, axisId, done) => {
+				const domain = chart.internal[axisId].domain();
+
+				// when
+				chart.toggle(dataId);
+
+				setTimeout(() => {
+					expect(chart.internal[axisId].domain()).to.be.deep.equal(domain);
+					done();
+				}, 300);
+			};
+
+			it("y Axis domain should maintain", done => {
+				checkDomain("data1", "y", done);
+			});
+
+			it("y2 Axis domain should maintain", done => {
+				checkDomain("data2", "y2", done);
+			});
+		});
 	});
 });

src/internals/domain.js

@@ -66,6 +66,18 @@ extend(ChartInternal.prototype, {
 		return this.getYDomainMinMax(targets, "max");
 	},
 
+	/**
+	 * Check if hidden targets bound to the given axis id
+	 * @return {Boolean}
+	 * @private
+	 */
+	isHiddenTargetWithYDomain(id) {
+		const $$ = this;
+
+		return $$.hiddenTargetIds
+			.some(v => $$.axis.getId(v) === id);
+	},
+
 	getYDomain(targets, axisId, xDomain) {
 		const $$ = this;
 		const config = $$.config;
@@ -78,12 +90,17 @@ extend(ChartInternal.prototype, {
 		const targetsByAxisId = targets.filter(t => $$.axis.getId(t.id) === axisId);
 		const yTargets = xDomain ? $$.filterByXDomain(targetsByAxisId, xDomain) : targetsByAxisId;
 
-		if (yTargets.length === 0) { // use domain of the other axis if target of axisId is none
-			return axisId === "y2" ?
-				$$.y.domain() :
-				// When all data bounds to y2, y Axis domain is called prior y2.
-				// So, it needs to call to get y2 domain here
-				$$.getYDomain(targets, "y2", xDomain);
+		if (yTargets.length === 0) {
+			if ($$.isHiddenTargetWithYDomain(axisId)) {
+				return $$[axisId].domain();
+			} else {
+				// use domain of the other axis if target of axisId is none
+				return axisId === "y2" ?
+					$$.y.domain() :
+					// When all data bounds to y2, y Axis domain is called prior y2.
+					// So, it needs to call to get y2 domain here
+					$$.getYDomain(targets, "y2", xDomain);
+			}
 		}
 
 		const yMin = config[`${pfx}_min`];