Workspace tabs

[fannar]

A useful addition to cmux would be tabs inside each workspace. Instead of a workspace having only one window, tabs would let you switch between multiple views within the same workspace. For example, one tab could be a single fullscreen terminal for focused work, another could contain several split terminals for multitasking (each with multiple tabs), and a third could be used for an integrated browser or reference view. This would make workspaces much more flexible by letting users organize different contexts without creating entirely separate workspaces.

[Solar-io]

Are you talking about tabs within the workspaces?

[fannar]

Yes :) essentially tabs within a workspace.

[shivangg]

This is the single biggest feature that keeps me going back to supacode, otherwise, cmux is totally there and way more polished.

Currently, I want full pane tabs under each workspaces to be able to keep dev servers running in 1 tab and 2nd tab onwards can be the agents CLIs.

[stevenocchipinti]

It would be really nice to have this working like ghostty does: each tab can have splits, rather than each split can have tabs

[stevenocchipinti]

I think this PR is aiming for the same goal:
#1437

[yarikRefine]

+1 on this, with a specific angle on the sidebar UX.

Right now the sidebar shows workspaces as vertical tabs, but the surfaces/tabs open inside a workspace are only visible as the horizontal tab bar of the currently active workspace. So if I have several workspaces each holding a few tabs, I can only ever see the tabs of the one I'm focused on.

What I'd love is for the sidebar to expand each workspace into a tree, listing its tabs (by name) nested underneath it — so I can see and jump to any tab in any workspace without switching workspaces first. Concretely:

▾ SQN - Shadowing
    console
    review
▾ some-other-workspace
    dev server
    agent CLI
    browser

This lines up with what @shivangg described (full pane tabs under each workspace) and would pair really well with the tabs-within-a-workspace model from the original post and #1437. Even an opt-in sidebar.showTabs / expandable-workspace toggle would be great.