vim: Allow : in empty panes and screen shares (#10171)

Release Notes:

- vim: Fixed `:` when no files are open

assets/keymaps/vim.json

@@ -546,6 +546,12 @@
       "escape": "buffer_search::Dismiss"
     }
   },
+  {
+    "context": "EmptyPane || SharedScreen",
+    "bindings": {
+      ":": "command_palette::Toggle"
+    }
+  },
   {
     // netrw compatibility
     "context": "ProjectPanel && not_editing",

crates/workspace/src/pane.rs

@@ -10,7 +10,7 @@ use futures::{stream::FuturesUnordered, StreamExt};
 use gpui::{
     actions, anchored, deferred, impl_actions, prelude::*, Action, AnchorCorner, AnyElement,
     AppContext, AsyncWindowContext, ClickEvent, DismissEvent, Div, DragMoveEvent, EntityId,
-    EventEmitter, ExternalPaths, FocusHandle, FocusableView, Model, MouseButton,
+    EventEmitter, ExternalPaths, FocusHandle, FocusableView, KeyContext, Model, MouseButton,
     NavigationDirection, Pixels, Point, PromptLevel, Render, ScrollHandle, Subscription, Task,
     View, ViewContext, VisualContext, WeakFocusHandle, WeakView, WindowContext,
 };
@@ -1733,8 +1733,14 @@ impl FocusableView for Pane {
 
 impl Render for Pane {
     fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        let mut key_context = KeyContext::default();
+        key_context.add("Pane");
+        if self.active_item().is_none() {
+            key_context.add("EmptyPane");
+        }
+
         v_flex()
-            .key_context("Pane")
+            .key_context(key_context)
             .track_focus(&self.focus_handle)
             .size_full()
             .flex_none()

crates/workspace/src/shared_screen.rs

@@ -70,6 +70,7 @@ impl Render for SharedScreen {
         div()
             .bg(cx.theme().colors().editor_background)
             .track_focus(&self.focus)
+            .key_context("SharedScreen")
             .size_full()
             .children(
                 self.frame