feat(ui5-select): implement angular two way data binding (#1583)

Author: fifoosid

packages/main/src/Select.js

@@ -391,7 +391,7 @@ class Select extends UI5Element {
 			this._selectedIndex = nextIndex === -1 ? this._selectedIndex : nextIndex;
 
 			if (shouldFireEvent) {
-				this.fireEvent("change", { selectedOption: this.options[nextIndex] });
+				this._fireChangeEvent(this.options[nextIndex]);
 			}
 		}
 
@@ -424,11 +424,19 @@ class Select extends UI5Element {
 			this._select(this._selectedIndexBeforeOpen);
 			this._escapePressed = false;
 		} else if (this._lastSelectedOption !== this.options[this._selectedIndex]) {
-			this.fireEvent("change", { selectedOption: this.options[this._selectedIndex] });
+			this._fireChangeEvent(this.options[this._selectedIndex]);
 			this._lastSelectedOption = this.options[this._selectedIndex];
 		}
 	}
 
+	_fireChangeEvent(selectedOption) {
+		this.fireEvent("change", { selectedOption });
+
+		//  Angular two way data binding
+		this.selectedItem = selectedOption;
+		this.fireEvent("selected-item-changed");
+	}
+
 	get valueStateTextMappings() {
 		const i18nBundle = this.i18nBundle;