Index jump to last on when number of contents changes

Which OS ?

ios

Version

Which versions are you using:

• react-native-swiper v? 1.5.3
• react-native v0.?.? 0.49.3

Sample code to show the problem

export class TestPage extends PureComponent {
    state = {
        active: false,
    };
    
    render() {

        let contents = [
            <View style={styles.slide1} key={1}>
                <Text style={styles.text}>Hello Swiper</Text>
            </View>
        ];

        if (this.state.active) {
            contents.push(
                <View style={styles.slide2} key={2}>
                    <Text style={styles.text}>Beautiful</Text>
                </View>
            );

            contents.push(
                <View style={styles.slide3} key={3}>
                    <Text style={styles.text}>And simple</Text>
                </View>
            );
        }
        return (
            <View style={styles.container}>
                <Swiper style={styles.wrapper} loop={true}>
                    {contents}
                </Swiper>

                <Button title="xxxx" onPress={() => this.setState({active: !this.state.active})}/>
            </View>
            
        );
    }
}


const styles = StyleSheet.create({
    container: {
        paddingTop: 20,
        backgroundColor: WHITE,
        flex: 1
    },
    tabContainer: {
        flex: 0,
    },
    wrapper: {},
    slide1: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: '#9DD6EB',
    },
    slide2: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: '#97CAE5',
    },
    slide3: {
        flex: 1,
        justifyContent: 'center',
        alignItems: 'center',
        backgroundColor: '#92BBD9',
    },
    text: {
        color: '#fff',
        fontSize: 30,
        fontWeight: 'bold',
    }
});

When the number of contents changes, it jumps to the last index. However, if loop is turned off, index stays when content changes.

Reproduce the issue with the provided TestPage sample on iOS using react-native-swiper 1.5.3 and React Native 0.49.3. Compare the Swiper behavior when the contents array changes with loop enabled versus disabled. Done means the current index remains stable when contents are added while loop is enabled.