Select zindex (#22109)

packages/grafana-ui/src/components/Forms/Select/SelectBase.tsx

-import React, { useRef } from 'react';
+import React from 'react';
 import { SelectableValue, deprecationWarning } from '@grafana/data';
 // @ts-ignore
 import { default as ReactSelect } from '@torkelo/react-select';
@@ -24,7 +24,6 @@ import { SingleValue } from './SingleValue';
 import { MultiValueContainer, MultiValueRemove } from './MultiValue';
 import { useTheme } from '../../../themes';
 import { getSelectStyles } from './getSelectStyles';
-import { RefForwardingPortal } from '../../Portal/Portal';
 
 type SelectValue<T> = T | SelectableValue<T> | T[] | Array<SelectableValue<T>>;
 
@@ -178,12 +177,10 @@ export function SelectBase<T>({
   components,
 }: SelectBaseProps<T>) {
   const theme = useTheme();
-  const portalRef = useRef<HTMLDivElement>();
   const styles = getSelectStyles(theme);
   let ReactSelectComponent: ReactSelect | Creatable = ReactSelect;
   const creatableProps: any = {};
   let asyncSelectProps: any = {};
-
   let selectedValue = [];
   if (isMulti && loadOptions) {
     selectedValue = value as any;
@@ -236,7 +233,6 @@ export function SelectBase<T>({
     renderControl,
     captureMenuScroll: false,
     blurInputOnSelect: true,
-    menuPortalTarget: portalRef.current,
     menuPlacement: 'auto',
   };
 
@@ -347,6 +343,7 @@ export function SelectBase<T>({
             width,
             position,
             marginBottom: !!bottom ? '10px' : '0',
+            zIndex: 9999,
           }),
         }}
         className={widthClass}
@@ -354,7 +351,6 @@ export function SelectBase<T>({
         {...creatableProps}
         {...asyncSelectProps}
       />
-      <RefForwardingPortal ref={portalRef as any} />
     </>
   );
 }