fix(ui5-multi-input): prevent form submission on enter

packages/main/cypress/specs/MultiInput.cy.tsx

@@ -544,6 +544,66 @@ describe("MultiInput tokens", () => {
 			.should("have.attr", "value", "Bulgaria");
 	});
 });
+
+describe("MultiInput Form Submission Prevention", () => {
+	it("should prevent form submission when Enter is pressed", () => {
+		cy.mount(
+			<form>
+				<MultiInput/>
+			</form>
+		);
+
+		cy.get("form")
+			.as("testForm")
+			.invoke('on', 'submit', cy.spy().as('formSubmit'));
+
+		cy.get("[ui5-multi-input]")
+			.shadow()
+			.find("input")
+			.as("innerInput");
+
+		cy.get("@innerInput")
+			.realClick()
+			.should("be.focused");
+
+		cy.get("@innerInput")
+			.realType("test value");
+
+		cy.get("@innerInput")
+			.realPress("Enter");
+
+		// Form submission should be prevented when there's a value
+		cy.get("@formSubmit").should("not.have.been.called");
+	});
+
+	it("should prevent form submission when there are multiple inputs in form", () => {
+		cy.mount(
+			<form>
+				<MultiInput id="mi-form-multi1" />
+				<MultiInput id="mi-form-multi2" />
+			</form>
+		);
+
+		cy.get("form")
+			.as("testForm")
+			.invoke('on', 'submit', cy.spy().as('formSubmit'));
+
+		cy.get("#mi-form-multi1")
+			.shadow()
+			.find("input")
+			.as("firstInput");
+
+		cy.get("@firstInput")
+			.realClick()
+			.should("be.focused");
+
+		cy.get("@firstInput")
+			.realPress("Enter");
+
+		cy.get("@formSubmit").should("not.have.been.called");
+	});
+});
+
 describe("MultiInput Truncated Token", () => {
 	beforeEach(() => {
 		cy.mount(

packages/main/src/MultiInput.ts

@@ -13,6 +13,8 @@ import {
 	isHome,
 	isEnd,
 	isDown,
+	isEnter,
+
 } from "@ui5/webcomponents-base/dist/Keys.js";
 import type { ITabbable } from "@ui5/webcomponents-base/dist/delegate/ItemNavigation.js";
 import { getScopedVarName } from "@ui5/webcomponents-base/dist/CustomElementsScope.js";
@@ -228,6 +230,10 @@ class MultiInput extends Input implements IFormInputElement {
 			return this._focusFirstToken(e);
 		}
 
+		if (isEnter(e)) {
+			e.preventDefault();
+		}
+
 		if (isLeft(e)) {
 			this._skipOpenSuggestions = true;
 			return this._handleLeft(e);