debugger: Show run to cursor in editor's context menu (#35745)

This also fixed a bug where evaluate selected text was an available
option when the selected debug session was terminated.


Release Notes:

- debugger: add Run to Cursor back to Editor's context menu

Co-authored-by: Remco Smits <djsmits12@gmail.com>

crates/gpui/src/window.rs

@@ -4248,6 +4248,25 @@ impl Window {
             .on_action(action_type, Rc::new(listener));
     }
 
+    /// Register an action listener on the window for the next frame if the condition is true.
+    /// The type of action is determined by the first parameter of the given listener.
+    /// When the next frame is rendered the listener will be cleared.
+    ///
+    /// This is a fairly low-level method, so prefer using action handlers on elements unless you have
+    /// a specific need to register a global listener.
+    pub fn on_action_when(
+        &mut self,
+        condition: bool,
+        action_type: TypeId,
+        listener: impl Fn(&dyn Any, DispatchPhase, &mut Window, &mut App) + 'static,
+    ) {
+        if condition {
+            self.next_frame
+                .dispatch_tree
+                .on_action(action_type, Rc::new(listener));
+        }
+    }
+
     /// Read information about the GPU backing this window.
     /// Currently returns None on Mac and Windows.
     pub fn gpu_specs(&self) -> Option<GpuSpecs> {