chore(ui5-carousel): restore incorrectly removed getter (UI5#12515)

* fix(ui5-carousel): add worngly removed getter

* fix(ui5-carousel): added decorator to private property

* fix(ui5-carousel): remove trailing space

* fix(ui5-carousel): fixed test case

Author: GerganaKremenska

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

@@ -389,6 +389,32 @@ describe("Carousel general interaction", () => {
 
 	});
 
+	it.only("navigateTo method and visibleItemsIndices", () => {
+		cy.mount(
+			<Carousel id="carousel9" itemsPerPage="S2 M2 L2 XL2" arrowsPlacement="Navigation">
+				<Button>Button 1</Button>
+				<Button>Button 2</Button>
+				<Button>Button 3</Button>
+				<Button>Button 4</Button>
+				<Button>Button 5</Button>
+				<Button>Button 6</Button>
+				<Button>Button 7</Button>
+				<Button>Button 8</Button>
+				<Button>Button 9</Button>
+				<Button>Button 10</Button>
+			</Carousel>);
+
+		cy.get("#carousel9")
+			.invoke("prop", "visibleItemsIndices")
+			.should("deep.equal", [0, 1]);
+
+		cy.get("#carousel9").shadow().find('[data-ui5-arrow-forward="true"]').realClick();
+
+		cy.get("#carousel9")
+			.invoke("prop", "visibleItemsIndices")
+			.should("deep.equal", [1, 2]);
+	});
+
 	it("F7 keyboard navigation", () => {
 		cy.mount(
 			<Carousel id="carouselF7" itemsPerPage="S3 M3 L3 XL3">

packages/main/src/Carousel.ts

@@ -184,17 +184,6 @@ class Carousel extends UI5Element {
 	@property({ type: Boolean })
 	hideNavigationArrows = false;
 
-	/**
-	 * Defines the current first visible item in the viewport.
-	 * Default value is 0, which means the first item in the viewport.
-	 *
-	 * @since 1.0.0-rc.15
-	 * @default 0
-	 * @public
-	 */
-	@property({ type: Number, noAttribute: true })
-	_currentSlideIndex: number = 0;
-
 	/**
 	 * Defines the visibility of the page indicator.
 	 * If set to true the page indicator will be hidden.
@@ -288,6 +277,14 @@ class Carousel extends UI5Element {
 	@property({ type: Boolean, noAttribute: true })
 	_visibleNavigationArrows = false;
 
+	/**
+	 * Defines the current slide index, which contains the visible item in the viewport.
+	 * @private
+	 * @since 2.16.0-r.c1
+	 */
+	@property({ type: Number, noAttribute: true })
+	_currentSlideIndex: number = 0;
+
 	_scrollEnablement: ScrollEnablement;
 	_onResizeBound: ResizeObserverCallback;
 	_resizing: boolean;
@@ -700,6 +697,16 @@ class Carousel extends UI5Element {
 		this.focusItem();
 	}
 
+	/**
+	 * The indices of the currently visible items of the component.
+	 * @public
+	 * @since 1.0.0-rc.15
+	 * @default []
+	 */
+	get visibleItemsIndices() : Array<number> {
+		return this._visibleItemsIndexes;
+	}
+
 	/**
 	 * Assuming that all items have the same width
 	 * @private