Calendar UI Bug - Left / Right Navigation - Invalid Header

[wrsulliv]

I'm submitting a ... (check one with "x")

• bug report
• feature request

Issue description

Current behavior:

The header of the "Calendar" component does not update as expected while using the left / right navigation buttons.

Expected behavior:

The header of the "Calendar" component properly updates while using the left / right navigation buttons.

Steps to reproduce:

1. Navigate to: https://akveo.github.io/react-native-ui-kitten/docs/components/calendar/overview#calendar

2. Observe that using the right navigation button does not update the Calendar header, and using the left navigation button produces an unexpected jump in months.

NOTE: If the website is unavailable in step 1, you can insert a "Calendar" component into a demo project from the 4.3.0-beta.1 build.

Related code:

Render the following component:

import { Calendar } from 'react-native-ui-kitten';

const ExampleComponent = () => {
    return <Calendar date={ new Date() } onSelect={ () => null } />;
}

Other information:

OS, device, package version

MacOS 10.14, 4.3.0-beta.1

[artyorsh]

Thanks for reporting this and #712. I've reviewed your PR #714 and left a comment on this. We can use this PR for the future discussion