Fix media modal prev button behavior. (#4158)
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@ -35,7 +35,7 @@ export default class MediaModal extends ImmutablePureComponent {
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}
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handlePrevClick = () => {
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this.setState({ index: (this.getIndex() - 1) % this.props.media.size });
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this.setState({ index: (this.props.media.size + this.getIndex() - 1) % this.props.media.size });
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}
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handleKeyUp = (e) => {
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