misc: make test name header sticky in studio and tests list

cli/CHANGELOG.md

@@ -20,6 +20,7 @@ _Released 10/20/2025 (PENDING)_
 - Add top padding for command log labels. Addressed in [#32774](https://github.com/cypress-io/cypress/pull/32774).
 - The hitbox for expanding a grouped command has been widened. Addresses [#32778](https://github.com/cypress-io/cypress/issues/32778). Addressed in [#32783](https://github.com/cypress-io/cypress/pull/32783).
 - Have cursor on hover of the AUT URL to show as pointer. Addresses [#32777](https://github.com/cypress-io/cypress/issues/32777). Addressed in [#32782](https://github.com/cypress-io/cypress/pull/32782).
+- Make test name header sticky in studio mode and in the tests list. Addresses [#32591](https://github.com/cypress-io/cypress/issues/32591). Addressed in [#32840](https://github.com/cypress-io/cypress/pull/32840)
 
 **Dependency Updates:**
 

packages/reporter/src/collapsible/collapsible.scss

@@ -1,3 +1,5 @@
+@import "../lib/mixins.scss";
+
 .reporter {
   .collapsible-indicator {
     margin-right: 8px;
@@ -8,4 +10,8 @@
   .is-open > .collapsible-header-wrapper > .collapsible-header > .collapsible-header-inner > .collapsible-indicator {
     transform: rotate(0);
   }
+
+  .runnable > .is-open > .collapsible-header-wrapper {
+    @include sticky-header-with-shadow;
+  }
 }

packages/reporter/src/collapsible/collapsible.tsx

@@ -1,5 +1,5 @@
 import cs from 'classnames'
-import React, { CSSProperties, MouseEvent, ReactNode, RefObject, useCallback, useState } from 'react'
+import React, { CSSProperties, MouseEvent, ReactNode, RefObject, useCallback, useEffect, useRef, useState } from 'react'
 import { onEnterOrSpace } from '../lib/util'
 import DocumentBlankIcon from '@packages/frontend-shared/src/assets/icons/document-blank_x16.svg'
 import { IconChevronDownSmall } from '@cypress-design/react-icon'
@@ -24,6 +24,8 @@ interface CollapsibleProps {
 
 const Collapsible: React.FC<CollapsibleProps> = ({ isOpen: isOpenAsProp = false, header, headerClass = '', headerStyle = {}, headerExtras, contentClass = '', hideExpander = false, containerRef = null, onOpenStateChangeRequested, children, HeaderComponent }) => {
   const [isOpenState, setIsOpenState] = useState(isOpenAsProp)
+  const headerRef = useRef<HTMLDivElement>(null)
+  const fixedElementRef = useRef<HTMLDivElement>(null)
 
   const toggleOpenState = useCallback((e?: MouseEvent) => {
     e?.stopPropagation()
@@ -36,9 +38,27 @@ const Collapsible: React.FC<CollapsibleProps> = ({ isOpen: isOpenAsProp = false,
 
   const isOpen = onOpenStateChangeRequested ? isOpenAsProp : isOpenState
 
+  const toggleHeaderShadow = (entries) => {
+    const [entry] = entries
+
+    headerRef.current?.classList.toggle('shadow-active', !entry.isIntersecting)
+  }
+
+  useEffect(() => {
+    if (!fixedElementRef?.current) return
+
+    const observer = new IntersectionObserver(toggleHeaderShadow)
+
+    observer.observe(fixedElementRef.current)
+
+    return () => observer.disconnect()
+  }, [])
+
   return (
     <div className={cs('collapsible', { 'is-open': isOpen })} ref={containerRef}>
-      <div className={cs('collapsible-header-wrapper', headerClass)}>
+      {/* This empty div acts as an intersection observer target to toggle the header shadow based on scroll position */}
+      <div ref={fixedElementRef}/>
+      <div className={cs('collapsible-header-wrapper', headerClass)} ref={headerRef}>
         <div
           aria-expanded={isOpen}
           className='collapsible-header'

packages/reporter/src/lib/mixins.scss

@@ -87,4 +87,22 @@
   right: 0;
   background: $linear-gradient;
   z-index: 0;
+}
+
+@mixin sticky-header-with-shadow {
+  position: sticky;
+  top: 0;
+  z-index: 1;
+  background-color: $gray-1100;
+
+  &.shadow-active::after {
+    content: "";
+    position: absolute;
+    top: 101%;
+    left: 0;
+    right: 0;
+    height: 16px;
+    background: linear-gradient(to bottom, $gray-1100 0%, rgba(22, 24, 39, 0.3) 100%);
+    pointer-events: none;
+  }
 }

packages/reporter/src/runnables/runnables.scss

@@ -108,7 +108,6 @@ $dotted-line-left-padding: 19px;
     width: 100%;
     color: $gray-400;
     background-color: $gray-1100;
-    overflow: auto;
     line-height: 18px;
 
     .runnable-wrapper {

packages/reporter/src/studio/StudioTest.scss

@@ -1,3 +1,5 @@
+@import "../lib/mixins.scss";
+
 .studio-single-test-container {
   display: flex;
   flex-direction: column;
@@ -15,6 +17,7 @@
   font-size: 14px;
   line-height: 20px;
   flex-shrink: 0;
+  @include sticky-header-with-shadow;
 
   .state-icon {
     height: 32px;

packages/reporter/src/studio/StudioTest.tsx

@@ -1,4 +1,4 @@
-import React, { useCallback, useMemo, useRef } from 'react'
+import React, { useCallback, useEffect, useMemo, useRef } from 'react'
 import { observer } from 'mobx-react'
 import { RunnablesStore } from '../runnables/runnables-store'
 import { Duration } from '../duration/duration'
@@ -65,6 +65,8 @@ export const StudioTest = observer(({ appState, runnablesStore, statsStore }: St
   // Single we're in single test mode, the current test is the first test in the runnablesStore._tests
   const currentTest = Object.values(runnablesStore._tests)[0]
   const tooltipRef = useRef<HTMLUListElement>(null)
+  const testSectionRef = useRef<HTMLDivElement>(null)
+  const fixedElementRef = useRef<HTMLDivElement>(null)
 
   const { containerRef, isMounted, scrollIntoView } = useScrollIntoView({
     appState,
@@ -89,10 +91,28 @@ export const StudioTest = observer(({ appState, runnablesStore, statsStore }: St
 
   const testTitle = currentTest ? <span data-cy='studio-single-test-title' className='studio-header__test-title'>{currentTest.title}</span> : null
 
+  const toggleHeaderShadow = (entries) => {
+    const [entry] = entries
+
+    testSectionRef.current?.classList.toggle('shadow-active', !entry.isIntersecting)
+  }
+
+  useEffect(() => {
+    if (!fixedElementRef.current) return
+
+    const observer = new IntersectionObserver(toggleHeaderShadow)
+
+    observer.observe(fixedElementRef.current)
+
+    return () => observer.disconnect()
+  }, [])
+
   return (
-    currentTest && (
-      <div className='studio-single-test-container' >
-        <div className='studio-header__test-section'>
+    currentTest && (<>
+      {/* This empty div acts as an intersection observer target to toggle the header shadow based on scroll position */}
+      <div ref={fixedElementRef} />
+      <div className='studio-single-test-container'>
+        <div className='studio-header__test-section' ref={testSectionRef}>
           <div className='studio-header__test-section-left'>
 
             <Tooltip placement='bottom' title={<p>All tests</p>} className='cy-tooltip'>
@@ -126,6 +146,7 @@ export const StudioTest = observer(({ appState, runnablesStore, statsStore }: St
           <Attempts isSingleStudioTest test={currentTest} scrollIntoView={scrollIntoView} />
         </div>
       </div>
+    </>
     )
   )
 })