Fix unnecessary re-rendering of various components when typing in web UI (#15286)
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		@@ -99,8 +99,13 @@ class ColumnsArea extends ImmutablePureComponent {
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    if (this.props.singleColumn !== prevProps.singleColumn && !this.props.singleColumn) {
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      this.node.addEventListener('wheel', this.handleWheel, supportsPassiveEvents ? { passive: true } : false);
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    }
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    this.lastIndex = getIndex(this.context.router.history.location.pathname);
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    this.setState({ shouldAnimate: true });
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    const newIndex = getIndex(this.context.router.history.location.pathname);
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    if (this.lastIndex !== newIndex) {
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      this.lastIndex = newIndex;
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      this.setState({ shouldAnimate: true });
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    }
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  }
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  componentWillUnmount () {
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