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LGC-2026-06-09T045216

LGC-2026-06-09T045216: Close current tab and open new one on hatch burn (#8770)
@malmstein malmstein tagged this 08 Jun 20:03 
Task/Issue URL:
https://app.asana.com/1/137249556945/project/1142021229838617/task/1215390332092907?focus=true

### Description

When a tab is burned from the New Tab Page **return hatch**
(`ORIGIN_HATCH`), the app now also **closes the tab the user is on and
opens a fresh new tab**, so they land on a clean tab instead of staying
on the burned page.

`BrowserActivity` handles this on
`FireDialog.EVENT_ON_SINGLE_TAB_CLEAR_COMPLETE`: it reads the `origin`
once, and for `ORIGIN_HATCH` calls `closeCurrentTab()` followed by
`launchNewTab()` (after the existing cleared-tab snackbar).

### Steps to test this PR

_Hatch burn closes the current tab and opens a new one_
- [ ] Get the New Tab Page to show the return hatch (open a tab, let the
app go idle, then return).
- [ ] Tap the hatch's fire/burn button and let the burn complete.
- [ ] Confirm the tab you were on is closed and you land on a fresh new
tab — not back on the burned page.

### UI changes
No UI changes — tab/navigation behaviour only.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Changes tab lifecycle on a specific fire-dialog completion path; scope
is narrow but affects which tab the user lands on after hatch burn.
> 
> **Overview**
> When a tab is burned from the **NTP return hatch** (`ORIGIN_HATCH`),
completing the fire dialog now **closes the active tab and opens a fresh
new tab** so the user is not left on the cleared page.
> 
> `BrowserActivity` handles this on
`FireDialog.EVENT_ON_SINGLE_TAB_CLEAR_COMPLETE` by reading the fire
`origin` once and, for hatch burns, calling `closeCurrentTab()` then
`launchNewTab()` after the existing cleared-tab snackbar.
> 
> `BrowserTabFragment` also calls **`hideKeyboard()`** when the return
hatch is tapped (before navigating back to the prior tab).
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
edb258e06121090917a26780f495f25b1cd76666. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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