Improve performance of Search list

[Kicu]

Details

• this comment gives context to the PR: [PAID] [$250] [Search v1] - Sometimes blank space appears instead of skeleton loader when scrolling #43396 (comment)
• this is a bit of a test, to see whether memoization of getItemHeight function will lead to better list performance
• the function getItemLayout is called multiple times by FlatList to get the sizes of items being rendered; This function is implemented inside our BaseSelectionList and in turn calls getItemHeight
• in theory after memoizing it the subsequent renders of every item should be a bit lighter because the heights are unchanged once items are rendered, so we will not recall the function
• this issue does not affect web in any way

results

To me results are inconclusive. I used React Profiler to profile rendering of list, then scrolling and lazy loading new items. When using the code with _.memoize rendering of whole List seems to be faster by around 2-3ms which is not a lot 🤷
I think a better test is for a few people build this and just get a feel for whether it looks good or bad.

NOTE:

• during scrolling of list the Search component is not re-rendering a lot - only once when new list items are fetched, so I believe we should not be putting any improvements or memoization to Search component itself.

CC @luacmartins

Fixed Issues

$ #43396
PROPOSAL:

Tests

• open Search on mobile
• scroll down multiple times
• see if this PR improves the problems from original issue connected

Offline tests

QA Steps

• open Search on mobile
• scroll down multiple times
• see if this PR improves the problems from original issue connected

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
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Screenshots/Videos

Android: Native

rec-and-searchlist.mp4

Android: mWeb Chrome

iOS: Native

rec-ios-searchlist.mp4

iOS: mWeb Safari

MacOS: Chrome / Safari

MacOS: Desktop

[melvin-bot]

@ahmedGaber93 Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

[luacmartins]

LGTM. @ahmedGaber93 are you able to check if this impacts the performance for you?

[ahmedGaber93]

@luacmartins Yes checking

[ahmedGaber93]

The performance slightly improved, but I still see blank space when fast scroll specially in the first render

ios native

20240710223611362.mp4

android web

20240710224606554.mp4

web

20240710223403835.mp4

[ahmedGaber93]

@luacmartins I still see blank space when fast scroll for the first render. videos above ☝️

[luacmartins]

I think that's fine for now. I'll take the small performance improvement while we still investigate other solutions.

[ahmedGaber93]

Reviewer Checklist

• I have verified the author checklist is complete (all boxes are checked off).
• I verified the correct issue is linked in the ### Fixed Issues section above
• I verified testing steps are clear and they cover the changes made in this PR
  • I verified the steps for local testing are in the Tests section
  • I verified the steps for Staging and/or Production testing are in the QA steps section
  • I verified the steps cover any possible failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
• I checked that screenshots or videos are included for tests on all platforms
• I included screenshots or videos for tests on all platforms
• I verified tests pass on all platforms & I tested again on:
  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
  • MacOS: Desktop
• If there are any errors in the console that are unrelated to this PR, I either fixed them (preferred) or linked to where I reported them in Slack
• I verified proper code patterns were followed (see Reviewing the code)
  • I verified that any callback methods that were added or modified are named for what the method does and never what callback they handle (i.e. toggleReport and not onIconClick).
  • I verified that the left part of a conditional rendering a React component is a boolean and NOT a string, e.g. myBool && <MyComponent />.
  • I verified that comments were added to code that is not self explanatory
  • I verified that any new or modified comments were clear, correct English, and explained "why" the code was doing something instead of only explaining "what" the code was doing.
  • I verified any copy / text shown in the product is localized by adding it to src/languages/* files and using the translation method
  • I verified all numbers, amounts, dates and phone numbers shown in the product are using the localization methods
  • I verified any copy / text that was added to the app is grammatically correct in English. It adheres to proper capitalization guidelines (note: only the first word of header/labels should be capitalized), and is either coming verbatim from figma or has been approved by marketing (in order to get marketing approval, ask the Bug Zero team member to add the Waiting for copy label to the issue)
  • I verified proper file naming conventions were followed for any new files or renamed files. All non-platform specific files are named after what they export and are not named "index.js". All platform-specific files are named for the platform the code supports as outlined in the README.
  • I verified the JSDocs style guidelines (in STYLE.md) were followed
• If a new code pattern is added I verified it was agreed to be used by multiple Expensify engineers
• I verified that this PR follows the guidelines as stated in the Review Guidelines
• I verified other components that can be impacted by these changes have been tested, and I retested again (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar have been tested & I retested again)
• I verified all code is DRY (the PR doesn't include any logic written more than once, with the exception of tests)
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• If any new file was added I verified that:
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• If a new CSS style is added I verified that:
  • A similar style doesn't already exist
  • The style can't be created with an existing StyleUtils function (i.e. StyleUtils.getBackgroundAndBorderStyle(theme.componentBG)
• If the PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
• If the PR modifies a generic component, I tested and verified that those changes do not break usages of that component in the rest of the App (i.e. if a shared library or component like Avatar is modified, I verified that Avatar is working as expected in all cases)
• If the PR modifies a component related to any of the existing Storybook stories, I tested and verified all stories for that component are still working as expected.
• If the PR modifies a component or page that can be accessed by a direct deeplink, I verified that the code functions as expected when the deeplink is used - from a logged in and logged out account.
• If the PR modifies the UI (e.g. new buttons, new UI components, changing the padding/spacing/sizing, moving components, etc) or modifies the form input styles:
  • I verified that all the inputs inside a form are aligned with each other.
  • I added Design label and/or tagged @Expensify/design so the design team can review the changes.
• If a new page is added, I verified it's using the ScrollView component to make it scrollable when more elements are added to the page.
• If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.
• I have checked off every checkbox in the PR reviewer checklist, including those that don't apply to this PR.

Screenshots/Videos

Android: Native

a.mp4

Android: mWeb Chrome

aw.mp4

iOS: Native

i.mp4

iOS: mWeb Safari

iw.mp4

MacOS: Chrome / Safari

w.mp4

MacOS: Desktop

desktop.mp4

[ahmedGaber93]

LGTM!

[OSBotify]

✋ This PR was not deployed to staging yet because QA is ongoing. It will be automatically deployed to staging after the next production release.

[OSBotify]

🚀 Deployed to staging by https://github.com/luacmartins in version: 9.0.7-3 🚀

platform	result
🤖 android 🤖	success ✅
🖥 desktop 🖥	success ✅
🍎 iOS 🍎	success ✅
🕸 web 🕸	success ✅

[OSBotify]

🚀 Cherry-picked to staging by https://github.com/thienlnam in version: 9.0.7-4 🚀

platform	result
🤖 android 🤖	success ✅
🖥 desktop 🖥	success ✅
🍎 iOS 🍎	failure ❌
🕸 web 🕸	success ✅

@Expensify/applauseleads please QA this PR and check it off on the deploy checklist if it passes.

[OSBotify]

🚀 Deployed to production by https://github.com/thienlnam in version: 9.0.7-8 🚀

platform	result
🤖 android 🤖	failure ❌
🖥 desktop 🖥	success ✅
🍎 iOS 🍎	failure ❌
🕸 web 🕸	success ✅

[OSBotify]

🚀 Deployed to production by https://github.com/mountiny in version: 9.0.8-6 🚀

platform	result
🤖 android 🤖	success ✅
🖥 desktop 🖥	success ✅
🍎 iOS 🍎	success ✅
🕸 web 🕸	success ✅