Keep the composer out of a dialog's field order

src/app/view.rs

@@ -62,6 +62,15 @@ impl App {
         }
     }
 
+    /// Whether a dialog covers the window. Focus moves through the whole widget
+    /// tree, so the layers below have to stay out of the dialog's field order.
+    pub(super) fn modal_open(&self) -> bool {
+        self.preferences_open
+            || self.pending_project_path.is_some()
+            || self.session_rename.is_some()
+            || self.menu_session().is_some()
+    }
+
     fn main_view(&self) -> Element<'_, Message> {
         let mut body = row![].width(Length::Fill).height(Length::Fill);
         if !self.config.interface.sidebar_collapsed {