Fix overlap of emoji button on search popup (mastodon#10978)

app/javascript/mastodon/features/compose/components/search.js

@@ -21,7 +21,7 @@ class SearchPopout extends React.PureComponent {
     const { style } = this.props;
     const extraInformation = searchEnabled ? <FormattedMessage id='search_popout.tips.full_text' defaultMessage='Simple text returns statuses you have written, favourited, boosted, or have been mentioned in, as well as matching usernames, display names, and hashtags.' /> : <FormattedMessage id='search_popout.tips.text' defaultMessage='Simple text returns matching display names, usernames and hashtags' />;
     return (
-      <div style={{ ...style, position: 'absolute', width: 285 }}>
+      <div style={{ ...style, position: 'absolute', width: 285, zIndex: 2 }}>
         <Motion defaultStyle={{ opacity: 0, scaleX: 0.85, scaleY: 0.75 }} style={{ opacity: spring(1, { damping: 35, stiffness: 400 }), scaleX: spring(1, { damping: 35, stiffness: 400 }), scaleY: spring(1, { damping: 35, stiffness: 400 }) }}>
           {({ opacity, scaleX, scaleY }) => (
             <div className='search-popout' style={{ opacity: opacity, transform: `scale(${scaleX}, ${scaleY})` }}>