fix unified search for long field inputs (#166024)

## Summary

Fixes https://github.com/elastic/kibana/issues/166019


![long-field-name-input](be343d1b-e639-4b04-9742-0bcf1e9f032d)


### Checklist

Delete any items that are not applicable to this PR.

- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] Any UI touched in this PR is usable by keyboard only (learn more
about [keyboard accessibility](https://webaim.org/techniques/keyboard/))
- [ ] Any UI touched in this PR does not create any new axe failures
(run axe in browser:
[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),
[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))
- [ ] This renders correctly on smaller devices using a responsive
layout. (You can test this [in your
browser](https://www.browserstack.com/guide/responsive-testing-on-local-server))
- [ ] This was checked for [cross-browser
compatibility](https://www.elastic.co/support/matrix#matrix_browsers)

### For maintainers

- [ ] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: nickofthyme <nicholas.partridge@elastic.co>
Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>
Co-authored-by: Stratoula Kalafateli <efstratia.kalafateli@elastic.co>

src/plugins/unified_search/public/filter_bar/filter_editor/generic_combo_box.tsx

@@ -20,6 +20,7 @@ export interface GenericComboBoxProps<T> {
     searchValue: string,
     OPTION_CONTENT_CLASSNAME: string
   ) => React.ReactNode;
+  inputRef?: ((instance: HTMLInputElement | null) => void) | undefined;
   [propName: string]: any;
 }
 

src/plugins/unified_search/public/filter_bar/filter_editor/phrase_value_input.tsx

@@ -31,12 +31,8 @@ const COMBOBOX_PADDINGS = 10;
 const DEFAULT_FONT = '14px Inter';
 
 class PhraseValueInputUI extends PhraseSuggestorUI<PhraseValueInputProps> {
-  comboBoxRef: React.RefObject<HTMLInputElement>;
+  comboBoxWrapperRef = React.createRef<HTMLDivElement>();
-
+  inputRef: HTMLInputElement | null = null;
-  constructor(props: PhraseValueInputProps) {
-    super(props);
-    this.comboBoxRef = React.createRef();
-  }
 
   public render() {
     return (
@@ -69,8 +65,11 @@ class PhraseValueInputUI extends PhraseSuggestorUI<PhraseValueInputProps> {
     const valueAsStr = String(value);
     const options = value ? uniq([valueAsStr, ...suggestions]) : suggestions;
     return (
-      <div ref={this.comboBoxRef}>
+      <div ref={this.comboBoxWrapperRef}>
         <StringComboBox
+          inputRef={(ref) => {
+            this.inputRef = ref;
+          }}
           isDisabled={this.props.disabled}
           fullWidth={fullWidth}
           compressed={this.props.compressed}
@@ -85,7 +84,13 @@ class PhraseValueInputUI extends PhraseSuggestorUI<PhraseValueInputProps> {
           options={options}
           getLabel={(option) => option}
           selectedOptions={value ? [valueAsStr] : []}
-          onChange={([newValue = '']) => onChange(newValue)}
+          onChange={([newValue = '']) => {
+            onChange(newValue);
+            setTimeout(() => {
+              // Note: requires a tick skip to correctly blur element focus
+              this.inputRef?.blur();
+            });
+          }}
           onSearchChange={this.onSearchChange}
           singleSelection={{ asPlainText: true }}
           onCreateOption={onChange}
@@ -98,7 +103,7 @@ class PhraseValueInputUI extends PhraseSuggestorUI<PhraseValueInputProps> {
                   defaultComboboxWidth={DEFAULT_COMBOBOX_WIDTH}
                   defaultFont={DEFAULT_FONT}
                   comboboxPaddings={COMBOBOX_PADDINGS}
-                  comboBoxRef={this.comboBoxRef}
+                  comboBoxWrapperRef={this.comboBoxWrapperRef}
                   label={option.label}
                   search={searchValue}
                 />

src/plugins/unified_search/public/filter_bar/filter_editor/phrases_values_input.tsx

@@ -33,12 +33,7 @@ const COMBOBOX_PADDINGS = 20;
 const DEFAULT_FONT = '14px Inter';
 
 class PhrasesValuesInputUI extends PhraseSuggestorUI<PhrasesValuesInputProps> {
-  comboBoxRef: React.RefObject<HTMLInputElement>;
+  comboBoxWrapperRef = React.createRef<HTMLDivElement>();
-
-  constructor(props: PhrasesValuesInputProps) {
-    super(props);
-    this.comboBoxRef = React.createRef();
-  }
 
   public render() {
     const { suggestions } = this.state;
@@ -46,7 +41,7 @@ class PhrasesValuesInputUI extends PhraseSuggestorUI<PhrasesValuesInputProps> {
     const options = values ? uniq([...values, ...suggestions]) : suggestions;
 
     return (
-      <div ref={this.comboBoxRef}>
+      <div ref={this.comboBoxWrapperRef}>
         <StringComboBox
           fullWidth={fullWidth}
           compressed={compressed}
@@ -79,7 +74,7 @@ class PhrasesValuesInputUI extends PhraseSuggestorUI<PhrasesValuesInputProps> {
                   defaultComboboxWidth={DEFAULT_COMBOBOX_WIDTH}
                   defaultFont={DEFAULT_FONT}
                   comboboxPaddings={COMBOBOX_PADDINGS}
-                  comboBoxRef={this.comboBoxRef}
+                  comboBoxWrapperRef={this.comboBoxWrapperRef}
                   label={option.label}
                   search={searchValue}
                 />

src/plugins/unified_search/public/filter_bar/filter_editor/truncated_label.test.tsx

@@ -6,18 +6,16 @@
  * Side Public License, v 1.
  */
 
-import React from 'react';
+import React, { ComponentProps } from 'react';
 import { mount } from 'enzyme';
 import { TruncatedLabel } from './truncated_label';
 
 describe('truncated_label', () => {
-  const defaultProps = {
+  const defaultProps: ComponentProps<typeof TruncatedLabel> = {
     defaultFont: '14px Inter',
-    // jest-canvas-mock mocks measureText as the number of string characters, thats why the width is so low
-    width: 30,
     defaultComboboxWidth: 130,
     comboboxPaddings: 100,
-    comboBoxRef: React.createRef<HTMLInputElement>(),
+    comboBoxWrapperRef: React.createRef<HTMLDivElement>(),
     search: '',
     label: 'example_field',
   };

src/plugins/unified_search/public/filter_bar/filter_editor/truncated_label.tsx

@@ -15,7 +15,7 @@ import { throttle } from 'lodash';
 interface TruncatedLabelProps {
   label: string;
   search: string;
-  comboBoxRef: RefObject<HTMLInputElement>;
+  comboBoxWrapperRef: RefObject<HTMLDivElement | null>;
   defaultFont: string;
   defaultComboboxWidth: number;
   comboboxPaddings: number;
@@ -56,7 +56,7 @@ const truncateLabel = (
 
 export const TruncatedLabel = React.memo(function TruncatedLabel({
   label,
-  comboBoxRef,
+  comboBoxWrapperRef,
   search,
   defaultFont,
   defaultComboboxWidth,
@@ -69,15 +69,14 @@ export const TruncatedLabel = React.memo(function TruncatedLabel({
     width: defaultComboboxWidth - comboboxPaddings,
     font: defaultFont,
   });
-
   const computeStyles = (_e: UIEvent | undefined, shouldRecomputeAll = false) => {
-    if (comboBoxRef.current) {
+    if (comboBoxWrapperRef.current) {
       const current = {
         ...labelProps,
-        width: comboBoxRef.current?.clientWidth - comboboxPaddings,
+        width: comboBoxWrapperRef.current.clientWidth - comboboxPaddings,
       };
       if (shouldRecomputeAll) {
-        current.font = window.getComputedStyle(comboBoxRef.current).font;
+        current.font = window.getComputedStyle(comboBoxWrapperRef.current).font;
       }
       setLabelProps(current);
     }
@@ -88,7 +87,7 @@ export const TruncatedLabel = React.memo(function TruncatedLabel({
   }, 50);
 
   useEffectOnce(() => {
-    if (comboBoxRef.current) {
+    if (comboBoxWrapperRef.current) {
       handleResize(undefined, true);
     }
 

src/plugins/unified_search/public/filters_builder/filter_item/field_input.tsx

@@ -43,7 +43,8 @@ export function FieldInput({ field, dataView, onHandleField }: FieldInputProps)
   const { disabled, suggestionsAbstraction } = useContext(FiltersBuilderContextType);
   const fields = dataView ? getFilterableFields(dataView) : [];
   const id = useGeneratedHtmlId({ prefix: 'fieldInput' });
-  const comboBoxRef = useRef<HTMLInputElement>(null);
+  const comboBoxWrapperRef = useRef<HTMLDivElement | null>(null);
+  const inputRef = useRef<HTMLInputElement | null>(null);
 
   const onFieldChange = useCallback(
     ([selectedField]: DataViewField[]) => {
@@ -77,12 +78,25 @@ export function FieldInput({ field, dataView, onHandleField }: FieldInputProps)
       ({ label }) => fields[optionFields.findIndex((optionField) => optionField.label === label)]
     );
     onFieldChange(newValues);
+
+    setTimeout(() => {
+      // Note: requires a tick skip to correctly blur element focus
+      inputRef?.current?.blur();
+    });
+  };
+
+  const handleFocus: React.FocusEventHandler<HTMLDivElement> = () => {
+    // Force focus on input due to https://github.com/elastic/eui/issues/7170
+    inputRef?.current?.focus();
   };
 
   return (
-    <div ref={comboBoxRef}>
+    <div ref={comboBoxWrapperRef}>
       <EuiComboBox
         id={id}
+        inputRef={(ref) => {
+          inputRef.current = ref;
+        }}
         options={euiOptions}
         selectedOptions={selectedEuiOptions}
         onChange={onComboBoxChange}
@@ -94,6 +108,7 @@ export function FieldInput({ field, dataView, onHandleField }: FieldInputProps)
         isClearable={false}
         compressed
         fullWidth
+        onFocus={handleFocus}
         data-test-subj="filterFieldSuggestionList"
         renderOption={(option, searchValue) => (
           <EuiFlexGroup gutterSize="s" alignItems="center" responsive={false}>
@@ -105,7 +120,7 @@ export function FieldInput({ field, dataView, onHandleField }: FieldInputProps)
                 defaultComboboxWidth={DEFAULT_COMBOBOX_WIDTH}
                 defaultFont={DEFAULT_FONT}
                 comboboxPaddings={COMBOBOX_PADDINGS}
-                comboBoxRef={comboBoxRef}
+                comboBoxWrapperRef={comboBoxWrapperRef}
                 label={option.label}
                 search={searchValue}
               />

src/plugins/unified_search/public/filters_builder/filter_item/filter_item.styles.ts

@@ -22,6 +22,13 @@ export const cursorOrCss = css`
 
 export const fieldAndParamCss = (euiTheme: EuiThemeComputed) => css`
   min-width: calc(${euiTheme.size.xl} * 5);
+  flex-grow: 1;
+  .euiFormRow {
+    max-width: 800px;
+  }
+  &:focus-within {
+    flex-grow: 4;
+  }
 `;
 
 export const operationCss = (euiTheme: EuiThemeComputed) => css`