[SQL Lab] Improved query and results tabs rendering reliability (#7082)

closes #7080

superset/assets/src/SqlLab/components/SouthPane.jsx

@@ -118,6 +118,7 @@ export class SouthPane extends React.PureComponent {
       <div className="SouthPane" ref={this.southPaneRef}>
         <Tabs
           bsStyle="tabs"
+          animation={false}
           id={shortid.generate()}
           activeKey={this.props.activeSouthPaneTab}
           onSelect={this.switchTab}

superset/assets/src/SqlLab/components/TabbedSqlEditors.jsx

@@ -260,6 +260,7 @@ class TabbedSqlEditors extends React.PureComponent {
     return (
       <Tabs
         bsStyle="tabs"
+        animation={false}
         activeKey={this.props.tabHistory[this.props.tabHistory.length - 1]}
         onSelect={this.handleSelect.bind(this)}
         id="a11y-query-editor-tabs"