fix(ui5-step-input): firing step input once when value is deleted (#3474)

fixes: #3457

Author: tsanislavgatev

packages/main/src/StepInput.js

@@ -502,8 +502,10 @@ class StepInput extends UI5Element {
 	}
 
 	_fireChangeEvent() {
-		this._previousValue = this.value;
-		this.fireEvent("change", { value: this.value });
+		if (this._previousValue !== this.value) {
+			this._previousValue = this.value;
+			this.fireEvent("change", { value: this.value });
+		}
 	}
 
 	/**
@@ -553,6 +555,9 @@ class StepInput extends UI5Element {
 	}
 
 	_onInputChange(event) {
+		if (this.input.value === "") {
+			this.input.value = this.min || 0;
+		}
 		const inputValue = this._preciseValue(parseFloat(this.input.value));
 		if (this.value !== this._previousValue || this.value !== inputValue) {
 			this.value = inputValue;

packages/main/test/specs/StepInput.spec.js

@@ -424,6 +424,25 @@ describe("'change' event firing", () => {
 		assert.strictEqual(Number(changeResult.getProperty("value")), 2, "'change' event is fired 2 times");
 	});
 
+	it("'change' event should be fired once after element deleted and focus out", () => {
+		browser.url(`http://localhost:${PORT}/test-resources/pages/StepInput.html`);
+		const siCozy = $("#stepInputCozy");
+		const siMinMax = $("#stepInputMinMax");
+		const changeResult = $("#changeResult");
+
+		siMinMax.click();
+		siMinMax.keys("ArrowUp");
+		siMinMax.keys("ArrowUp");
+		siMinMax.keys("ArrowUp");
+		siCozy.click();
+		assert.strictEqual(siMinMax.getProperty("value"), 3, "Value is increased correctly to 3");
+		assert.strictEqual(Number(changeResult.getProperty("value")), 1, "'change' event is fired 1 time");
+		siMinMax.doubleClick();
+		siMinMax.keys("Backspace");
+		siCozy.click();
+		assert.strictEqual(siMinMax.getProperty("value"), 0, "Value is increased correctly to 1");
+		assert.strictEqual(Number(changeResult.getProperty("value")), 2, "'change' event is fired 2 times");
+	});
 });
 
 describe("Accessibility related parameters", () => {