Fix panel deserialization (#4198)

In the old world, panel loading happened strictly before workspace
deserialization. Now it's inverted.

Fix this by storing on the dock the serialized state so they can restore
state as panels are loaded.

[[PR Description]]

Release Notes:

- Fixed Zed forgetting which panels were open on boot.
([#2406](https://github.com/zed-industries/community/issues/2406)).

crates/workspace/src/dock.rs

@@ -1,3 +1,4 @@
+use crate::persistence::model::DockData;
 use crate::DraggedDock;
 use crate::{status_bar::StatusItemView, Workspace};
 use gpui::{
@@ -141,6 +142,7 @@ pub struct Dock {
     is_open: bool,
     active_panel_index: usize,
     focus_handle: FocusHandle,
+    pub(crate) serialized_dock: Option<DockData>,
     _focus_subscription: Subscription,
 }
 
@@ -201,6 +203,7 @@ impl Dock {
                 is_open: false,
                 focus_handle: focus_handle.clone(),
                 _focus_subscription: focus_subscription,
+                serialized_dock: None,
             }
         });
 
@@ -408,10 +411,26 @@ impl Dock {
             }),
         ];
 
+        let name = panel.persistent_name().to_string();
+
         self.panel_entries.push(PanelEntry {
             panel: Arc::new(panel),
             _subscriptions: subscriptions,
         });
+        if let Some(serialized) = self.serialized_dock.clone() {
+            if serialized.active_panel == Some(name) {
+                self.activate_panel(self.panel_entries.len() - 1, cx);
+                if serialized.visible {
+                    self.set_open(true, cx);
+                }
+                if serialized.zoom {
+                    if let Some(panel) = self.active_panel() {
+                        panel.set_zoomed(true, cx)
+                    };
+                }
+            }
+        }
+
         cx.notify()
     }
 

crates/workspace/src/workspace.rs

@@ -1681,6 +1681,18 @@ impl Workspace {
         None
     }
 
+    /// Open the panel of the given type
+    pub fn open_panel<T: Panel>(&mut self, cx: &mut ViewContext<Self>) {
+        for dock in [&self.left_dock, &self.bottom_dock, &self.right_dock] {
+            if let Some(panel_index) = dock.read(cx).panel_index_for_type::<T>() {
+                dock.update(cx, |dock, cx| {
+                    dock.activate_panel(panel_index, cx);
+                    dock.set_open(true, cx);
+                });
+            }
+        }
+    }
+
     pub fn panel<T: Panel>(&self, cx: &WindowContext) -> Option<View<T>> {
         for dock in [&self.left_dock, &self.bottom_dock, &self.right_dock] {
             let dock = dock.read(cx);
@@ -3175,49 +3187,19 @@ impl Workspace {
                 }
 
                 let docks = serialized_workspace.docks;
-                workspace.left_dock.update(cx, |dock, cx| {
-                    dock.set_open(docks.left.visible, cx);
-                    if let Some(active_panel) = docks.left.active_panel {
-                        if let Some(ix) = dock.panel_index_for_persistent_name(&active_panel, cx) {
-                            dock.activate_panel(ix, cx);
-                        }
-                    }
-                    dock.active_panel()
-                        .map(|panel| panel.set_zoomed(docks.left.zoom, cx));
-                    if docks.left.visible && docks.left.zoom {
-                        cx.focus_self()
-                    }
-                });
-                // TODO: I think the bug is that setting zoom or active undoes the bottom zoom or something
-                workspace.right_dock.update(cx, |dock, cx| {
-                    dock.set_open(docks.right.visible, cx);
-                    if let Some(active_panel) = docks.right.active_panel {
-                        if let Some(ix) = dock.panel_index_for_persistent_name(&active_panel, cx) {
-                            dock.activate_panel(ix, cx);
-                        }
-                    }
-                    dock.active_panel()
-                        .map(|panel| panel.set_zoomed(docks.right.zoom, cx));
 
-                    if docks.right.visible && docks.right.zoom {
-                        cx.focus_self()
-                    }
-                });
-                workspace.bottom_dock.update(cx, |dock, cx| {
-                    dock.set_open(docks.bottom.visible, cx);
-                    if let Some(active_panel) = docks.bottom.active_panel {
-                        if let Some(ix) = dock.panel_index_for_persistent_name(&active_panel, cx) {
-                            dock.activate_panel(ix, cx);
-                        }
-                    }
-
-                    dock.active_panel()
-                        .map(|panel| panel.set_zoomed(docks.bottom.zoom, cx));
-
-                    if docks.bottom.visible && docks.bottom.zoom {
-                        cx.focus_self()
-                    }
-                });
+                let right = docks.right.clone();
+                workspace
+                    .right_dock
+                    .update(cx, |dock, _| dock.serialized_dock = Some(right));
+                let left = docks.left.clone();
+                workspace
+                    .left_dock
+                    .update(cx, |dock, _| dock.serialized_dock = Some(left));
+                let bottom = docks.bottom.clone();
+                workspace
+                    .bottom_dock
+                    .update(cx, |dock, _| dock.serialized_dock = Some(bottom));
 
                 cx.notify();
             })?;