panel: Remove unused panel crate (#63742)

# Objective

remove unused crate

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

---

Release Notes:

- N/A

---------

Signed-off-by: Xiaobo Liu <cppcoffee@gmail.com>
Co-authored-by: MrSubidubi <finn@zed.dev>

Cargo.lock

@@ -7197,7 +7197,6 @@ dependencies = [
  "menu",
  "multi_buffer",
  "notifications",
- "panel",
  "picker",
  "pretty_assertions",
  "project",
@@ -12521,15 +12520,6 @@ dependencies = [
  "syn 2.0.117",
 ]
 
-[[package]]
-name = "panel"
-version = "0.1.0"
-dependencies = [
- "gpui",
- "ui",
- "workspace",
-]
-
 [[package]]
 name = "parking"
 version = "2.2.1"

Cargo.toml

@@ -155,7 +155,6 @@ members = [
     "crates/opencode",
     "crates/outline",
     "crates/outline_panel",
-    "crates/panel",
     "crates/path",
     "crates/paths",
     "crates/picker",
@@ -423,7 +422,6 @@ openai_subscribed = { path = "crates/openai_subscribed" }
 opencode = { path = "crates/opencode" }
 outline = { path = "crates/outline" }
 outline_panel = { path = "crates/outline_panel" }
-panel = { path = "crates/panel" }
 path = { path = "crates/path" }
 paths = { path = "crates/paths" }
 perf = { path = "tooling/perf" }

crates/git_ui/Cargo.toml

@@ -43,7 +43,6 @@ markdown.workspace = true
 menu.workspace = true
 multi_buffer.workspace = true
 notifications.workspace = true
-panel.workspace = true
 picker.workspace = true
 project.workspace = true
 prompt_store.workspace = true

crates/git_ui/src/git_panel.rs

@@ -62,7 +62,6 @@ use language_model::{
 use menu;
 use multi_buffer::ExcerptBoundaryInfo;
 use notifications::status_toast::StatusToast;
-use panel::PanelHeader;
 use project::git_store::GitAccess;
 use project::{
     Fs, Project, ProjectPath,
@@ -9173,8 +9172,6 @@ impl Panel for GitPanel {
     }
 }
 
-impl PanelHeader for GitPanel {}
-
 pub fn panel_editor_container(_window: &mut Window, cx: &mut App) -> Div {
     v_flex()
         .size_full()

crates/panel/Cargo.toml

@@ -1,17 +0,0 @@
-[package]
-name = "panel"
-version = "0.1.0"
-edition.workspace = true
-publish.workspace = true
-license = "GPL-3.0-or-later"
-
-[lints]
-workspace = true
-
-[lib]
-path = "src/panel.rs"
-
-[dependencies]
-gpui.workspace = true
-ui.workspace = true
-workspace.workspace = true

crates/panel/LICENSE-GPL

@@ -1 +0,0 @@
-../../LICENSE-GPL

crates/panel/src/panel.rs

@@ -1,35 +0,0 @@
-use gpui::actions;
-use ui::prelude::*;
-
-actions!(
-    panel,
-    [
-        /// Navigates to the next tab in the panel.
-        NextPanelTab,
-        /// Navigates to the previous tab in the panel.
-        PreviousPanelTab
-    ]
-);
-
-pub trait PanelHeader: workspace::Panel {}
-
-/// Implement this trait to enable a panel to have tabs.
-pub trait PanelTabs: PanelHeader {
-    /// Returns the index of the currently selected tab.
-    fn selected_tab(&self, cx: &mut App) -> usize;
-    /// Selects the tab at the given index.
-    fn select_tab(&self, cx: &mut App, index: usize);
-    /// Moves to the next tab.
-    fn next_tab(&self, _: NextPanelTab, cx: &mut App) -> Self;
-    /// Moves to the previous tab.
-    fn previous_tab(&self, _: PreviousPanelTab, cx: &mut App) -> Self;
-}
-
-#[derive(IntoElement)]
-pub struct PanelTab {}
-
-impl RenderOnce for PanelTab {
-    fn render(self, _window: &mut Window, _cx: &mut App) -> impl IntoElement {
-        div()
-    }
-}

crates/zed/src/zed.rs

@@ -5938,7 +5938,6 @@ mod tests {
                 "outline",
                 "outline_panel",
                 "pane",
-                "panel",
                 "picker",
                 "project_panel",
                 "project_search",