Fix panel deserialization

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.

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()
     }