Restore the ability to search terminals in the terminal panel (#2528)

Fixes
https://linear.app/zed-industries/issue/Z-1812/find-in-terminal-panel-is-broken

![CleanShot 2023-05-25 at 15 18
01@2x](https://github.com/zed-industries/zed/assets/482957/ddb33b61-d253-4de1-961f-14b24aaa3e46)

This also removes navigation controls from the terminal panel, given
that terminals don't make use of that feature anyway. When the toolbar
is empty, we'll avoid showing it altogether.

![CleanShot 2023-05-25 at 15 17
26@2x](https://github.com/zed-industries/zed/assets/482957/52419f2c-bca0-494a-a9b3-88e183b4c12f)


Release Notes:

- Fixed a regression that was preventing the terminal panel from being
searched.

Cargo.lock

@@ -6809,6 +6809,7 @@ dependencies = [
  "procinfo",
  "project",
  "rand 0.8.5",
+ "search",
  "serde",
  "serde_derive",
  "settings",

crates/terminal_view/Cargo.toml

@@ -14,6 +14,7 @@ editor = { path = "../editor" }
 language = { path = "../language" }
 gpui = { path = "../gpui" }
 project = { path = "../project" }
+search = { path = "../search" }
 settings = { path = "../settings" }
 theme = { path = "../theme" }
 util = { path = "../util" }

crates/terminal_view/src/terminal_panel.rs

@@ -55,6 +55,7 @@ impl TerminalPanel {
                 cx,
             );
             pane.set_can_split(false, cx);
+            pane.set_can_navigate(false, cx);
             pane.on_can_drop(move |drag_and_drop, cx| {
                 drag_and_drop
                     .currently_dragged::<DraggedItem>(window_id)
@@ -99,6 +100,9 @@ impl TerminalPanel {
                     ))
                     .into_any()
             });
+            let buffer_search_bar = cx.add_view(search::BufferSearchBar::new);
+            pane.toolbar()
+                .update(cx, |toolbar, cx| toolbar.add_item(buffer_search_bar, cx));
             pane
         });
         let subscriptions = vec![

crates/workspace/src/pane.rs

@@ -164,6 +164,7 @@ pub struct Pane {
     has_focus: bool,
     can_drop: Rc<dyn Fn(&DragAndDrop<Workspace>, &WindowContext) -> bool>,
     can_split: bool,
+    can_navigate: bool,
     render_tab_bar_buttons: Rc<dyn Fn(&mut Pane, &mut ViewContext<Pane>) -> AnyElement<Pane>>,
 }
 
@@ -279,6 +280,7 @@ impl Pane {
             has_focus: false,
             can_drop: Rc::new(|_, _| true),
             can_split: true,
+            can_navigate: true,
             render_tab_bar_buttons: Rc::new(|pane, cx| {
                 Flex::row()
                     // New menu
@@ -346,6 +348,14 @@ impl Pane {
         cx.notify();
     }
 
+    pub fn set_can_navigate(&mut self, can_navigate: bool, cx: &mut ViewContext<Self>) {
+        self.can_navigate = can_navigate;
+        self.toolbar.update(cx, |toolbar, cx| {
+            toolbar.set_can_navigate(can_navigate, cx);
+        });
+        cx.notify();
+    }
+
     pub fn set_render_tab_bar_buttons<F>(&mut self, cx: &mut ViewContext<Self>, render: F)
     where
         F: 'static + Fn(&mut Pane, &mut ViewContext<Pane>) -> AnyElement<Pane>,
@@ -430,6 +440,10 @@ impl Pane {
         cx: &mut ViewContext<Workspace>,
     ) -> Task<Result<()>> {
         let to_load = if let Some(pane) = pane.upgrade(cx) {
+            if !pane.read(cx).can_navigate {
+                return Task::ready(Ok(()));
+            }
+
             cx.focus(&pane);
 
             pane.update(cx, |pane, cx| {

crates/workspace/src/toolbar.rs

@@ -53,6 +53,7 @@ pub enum ToolbarItemLocation {
 pub struct Toolbar {
     active_pane_item: Option<Box<dyn ItemHandle>>,
     hidden: bool,
+    can_navigate: bool,
     pane: WeakViewHandle<Pane>,
     items: Vec<(Box<dyn ToolbarItemViewHandle>, ToolbarItemLocation)>,
 }
@@ -132,10 +133,9 @@ impl View for Toolbar {
         let button_style = theme.nav_button;
         let tooltip_style = theme::current(cx).tooltip.clone();
 
-        Flex::column()
+        let mut primary_items = Flex::row();
-            .with_child(
+        if self.can_navigate {
-                Flex::row()
+            primary_items.add_child(nav_button(
-                    .with_child(nav_button(
                 "icons/arrow_left_16.svg",
                 button_style,
                 nav_button_height,
@@ -163,8 +163,8 @@ impl View for Toolbar {
                 super::GoBack { pane: None },
                 "Go Back",
                 cx,
-                    ))
+            ));
-                    .with_child(nav_button(
+            primary_items.add_child(nav_button(
                 "icons/arrow_right_16.svg",
                 button_style,
                 nav_button_height,
@@ -192,17 +192,28 @@ impl View for Toolbar {
                 super::GoForward { pane: None },
                 "Go Forward",
                 cx,
-                    ))
+            ));
-                    .with_children(primary_left_items)
+        }
-                    .with_children(primary_right_items)
+        primary_items.extend(primary_left_items);
-                    .constrained()
+        primary_items.extend(primary_right_items);
-                    .with_height(height),
+
-            )
+        let mut toolbar = Flex::column();
-            .with_children(secondary_item)
+        if !primary_items.is_empty() {
+            toolbar.add_child(primary_items.constrained().with_height(height));
+        }
+        if let Some(secondary_item) = secondary_item {
+            toolbar.add_child(secondary_item);
+        }
+
+        if toolbar.is_empty() {
+            toolbar.into_any_named("toolbar")
+        } else {
+            toolbar
                 .contained()
                 .with_style(container_style)
                 .into_any_named("toolbar")
         }
+    }
 }
 
 #[allow(clippy::too_many_arguments)]
@@ -264,9 +275,15 @@ impl Toolbar {
             pane,
             items: Default::default(),
             hidden: false,
+            can_navigate: true,
         }
     }
 
+    pub fn set_can_navigate(&mut self, can_navigate: bool, cx: &mut ViewContext<Self>) {
+        self.can_navigate = can_navigate;
+        cx.notify();
+    }
+
     pub fn add_item<T>(&mut self, item: ViewHandle<T>, cx: &mut ViewContext<Self>)
     where
         T: 'static + ToolbarItemView,