Add ctrl-w _ and ctrl-w = (#21227)

Closes #ISSUE

Release Notes:

- vim: Add support for `ctrl-w _` and `ctrl-w =`

crates/workspace/src/workspace.rs

@@ -2946,6 +2946,10 @@ impl Workspace {
         }
     }
 
+    pub fn bounding_box_for_pane(&self, pane: &View<Pane>) -> Option<Bounds<Pixels>> {
+        self.center.bounding_box_for_pane(pane)
+    }
+
     pub fn find_pane_in_direction(
         &mut self,
         direction: SplitDirection,
@@ -2994,6 +2998,11 @@ impl Workspace {
         cx.notify();
     }
 
+    pub fn reset_pane_sizes(&mut self, cx: &mut ViewContext<Self>) {
+        self.center.reset_pane_sizes();
+        cx.notify();
+    }
+
     fn handle_pane_focused(&mut self, pane: View<Pane>, cx: &mut ViewContext<Self>) {
         // This is explicitly hoisted out of the following check for pane identity as
         // terminal panel panes are not registered as a center panes.