Setting to not auto-open the threads sidebar when adding a workspace to the current window

[thetravisweber]

Problem

When a project is opened into an existing window (default_open_behavior / cli_default_open_behavior set to "existing_window"), Zed always opens the threads sidebar. There's no way to add a workspace to the current window and leave the sidebar closed, so I have to press cmd-alt-j every time to hide it again.

The sidebar is opened unconditionally in crates/workspace/src/workspace.rs (in the add_dirs_to_sidebar branch, multi_workspace.open_sidebar(cx)). This happens on v1.19.2 and on main.

Proposal

Add a setting that controls whether the sidebar opens automatically when a workspace is added to an existing window, for example:

"agent": {
  "open_sidebar_on_add_workspace": false
}

Keep the current behavior (true) as the default. When it's false, the new workspace should still be added to the window, and the sidebar should stay in whatever state the user last left it.

Environment

Zed 1.19.2, macOS

[leviFrosty]

Please!!!!! I'm so tired of having the threads sidebar open by default

[leviFrosty]

This is MUCH more problematic when using worktrees. Each worktree opens the threads sidebar in the current experience. Very annoying when reviewing many agents' work.

[JosephTLyons]

A setting to control automatic opening of the Threads Sidebar has shipped in Zed Stable v1.22.0!

Set agent.threads_sidebar.auto_open to false to prevent opening a folder in an existing window from automatically opening the sidebar.

Thanks to @jackhwalters and @joshkent94 for the implementation!