Refactor FXIOS-13352 [Tab Manager] Fix delay in “Close All Tabs” action (#29046)

[Aniket-pd]

📜 Tickets

Jira ticket
Github issue

💡 Description

This PR refactors the “Close All Tabs” flow to fix the visual delay reported in #29046.

• Added an isClosingAllTabs flag to ensure the flow only fires once.
• On confirmation, launchCloseAllTabsAnimation() now starts the close-all animation immediately on the next main-queue turn, dismissing alerts first and deferring the actual purge until finishClosingAllTabs() runs after the animation completes.
• Introduced performCloseAllTabsAnimation in TabDisplayView to provide a consistent scale/fade transition, skip the effect if Reduce Motion is enabled, and restore cell state if interrupted.
• Updated removeAllTabs to batch tab removals:
  • Snapshot full tab list and selection before iteration (ensuring undo reflects the pre-close state).
  • Remove tabs in-memory (flushToDisk: false), then commit changes once.
  • Preserves analytics, counters, and toast hooks as a single event.

Result: Animations begin instantly when the user confirms, persistence and undo handling are more efficient, and main-thread blocking from repeated disk flushes is eliminated.

📝 Checklist

• I filled in the ticket numbers and a description of my work
• I updated the PR name to follow our PR naming guidelines
• I ensured unit tests pass and wrote tests for new code
• If working on UI, I checked and implemented accessibility (Dynamic Text and VoiceOver)
• If adding telemetry, I read the data stewardship requirements and will request a data review
• If adding or modifying strings, I read the guidelines and will request a string review from l10n
• If needed, I updated documentation and added comments to complex code

[Aniket-pd]

i have added a custom closing animation that kicks in right after confirmation, so the transition feels instant while the actual tab removal happens afterwards

[Foxbolts]

Hey @Aniket-pd, thank you for another contribution! Tagging @lmarceau as she has more familiarity with the tab tray.

[lmarceau]

I'll have a first look shortly to provide some feedback, but FYI we'll need feedback as well from @mattreaganmozilla since he had an extensive look into that particular problem already

[lmarceau]

Hello! Had a look and I understand part of this PR is an animation to improve the "Close all tabs", but the original issue is really an optimization problem of the closing tabs functionality. I just added further information on the ticket itself on how to replicate.

Here is a video showcasing the problem. After I click the "Close all tabs", the application freezes. This is on the current branch, so the problem is still present with the suggested changes. The animation IMO is not helping this particular problem.

Simulator.Screen.Recording.-.iPhone.17.Pro.-.2025-10-02.at.20.00.59.mov

[mattreaganmozilla]

Thanks @lmarceau for the context/comments. Linking this here just to cross-reference: #26782

[Aniket-pd]

hey @lmarceau! , I’ve opened a new PR with a different approach to this fix , continuing from here: #29974