Tabs lose their title (reset to "New session") when moved into a tab group

[behinddwalls]

Pre-submit Checks

• I have searched Warp bugs and there are no duplicates
• I have searched Warp known issues page and my issue is not there

Describe the bug

Moving a tab into a tab group resets its title to the generic New session. The title the tab had before it was grouped is discarded, so every tab inside a group looks identical and there is no way to tell them apart.

Related but different: #14514 asks to be able to rename tabs inside a group. This is about existing titles being lost simply by moving the tab into the group.

To reproduce

1. Open a few tabs and let each pick up a distinct title.
2. Right-click a tab → New group with tab, then move the other tabs into that group.
3. The tabs inside the group now all read New session.

Expected behavior

Grouping a tab should only change where it sits in the sidebar, not its title. Tabs should keep their titles when moved into or out of a group.

Screenshots, videos, and logs

In the screenshot below, the two tabs inside New Group both show New session, while the ungrouped tabs beneath it still show their real titles.

Operating system (OS)

macOS

Operating system and version

macOS 26.5.2

Current Warp version

v0.2026.07.15.08.55.01

Regression

Yes, this bug started recently or with an X Warp version

Does this block you from using Warp daily?

No

Is this an issue only in Warp?

Yes, I confirmed that this only happens in Warp, not other terminals.

[oz-for-oss]

@behinddwalls

Here's what I found while triaging this issue:

This appears to be a vertical-tabs grouped-tabs display bug: moving the tab into a group likely hides the existing tab-level title rather than corrupting the session itself. The report has enough detail for initial routing without more information.

I've flagged this for the factory auto-implement queue.

Maintainer details

I concluded that tabs moved into a vertical tab group appear to lose their existing display title because the grouped Panes-mode renderer suppresses the tab-level title override and falls back to the generic terminal title..

Triage summary

This looks like a client-side grouped-tabs rendering bug in the vertical tabs sidebar. The report is distinct from #14514: that issue asks for rename capability inside groups, while this one reports that an already-visible tab title stops being rendered after the tab is moved into a group.

Likely implementation area:

• app/src/workspace/view/vertical_tabs.rs renders grouped tab containers and member rows. In render_tab_group_internal, grouped member tabs in Panes display granularity force displayed_tab_title_override to None, and the surrounding tab-level header is not rendered for members inside a group.
• app/src/workspace/view.rs owns new_tab_group_from_tab and move_tab_to_group; those paths appear to update only grouping/reordering state, so the current evidence points more toward display-title selection than actual title mutation.
• app/src/tab.rs defines the tab-group context menu entries that trigger NewTabGroupFromTab / MoveTabToGroup.
• app/src/workspace/view/vertical_tabs_tests.rs is the likely place to add regression coverage for preserving visible tab titles for grouped members.

Duplicate check: I enumerated open issues with pagination and checked recently closed issues from the last 7 days. The closest related issues are #14514, #9666, and #14689, but they cover rename/search behavior rather than this specific grouping-induced title loss, so I am not marking this as a duplicate.

No reporter follow-up is needed for initial routing; the repro steps and visual evidence are sufficient.

This is my automated analysis and may be incorrect. A maintainer will verify the details.

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[warp-agent-staging]

Opened a draft PR for this: #14785.

Confirmed the title is not actually mutated by grouping — new_tab_group_from_tab / move_tab_to_group only change group_id, pinned state, and ordering. The title disappears purely at render time: in the default "View as: Panes" mode, a tab inside a group is rendered without the per-tab container that carries its title header, so only the pane rows remain and the tab falls back to its pane's generated title (New session for a fresh terminal).

The PR restores that title header for grouped members under the same conditions as ungrouped tabs, so grouping only changes where a tab sits. Renaming a tab inside a group (#14514) is intentionally out of scope.