fix: first attempt at fixing scopes for widgets with children

crates/eww/src/state/scope_graph.rs

@@ -220,6 +220,9 @@ impl ScopeGraph {
             let listener = Rc::new(listener);
             for required_var in &listener.needed_variables {
                 scope.listeners.entry(required_var.clone()).or_default().push(listener.clone());
+                // debug print: if this number grows indefinetly, something is wrong, otherwise this shows that there is activity
+                // TODO: remove
+                log::info!("{:?} listeners for {required_var}", scope.listeners.get(&required_var.clone()).map(|x| x.len()));
             }
 
             let required_variables = self.lookup_variables_in_scope(scope_index, &listener.needed_variables)?;

crates/eww/src/widgets/build_widget.rs

@@ -288,6 +288,9 @@ fn build_children_special_widget(
     gtk_container: &gtk::Container,
     custom_widget_invocation: Rc<CustomWidgetInvocation>,
 ) -> Result<()> {
+    // open a new scope for the children
+    // TODO this might be unnecessary, evaluate whether we can just use the calling_scope
+    let scope = tree.register_new_scope("children".into(), Some(calling_scope), calling_scope, HashMap::new())?;
     if let Some(nth) = widget_use.nth_expr {
         // TODORW this might not be necessary, if I can keep a copy of the widget I can destroy it directly, no need to go through the container.
         // This should be a custom gtk::Bin subclass,..
@@ -306,13 +309,8 @@ fn build_children_special_widget(
                             .children
                             .get(nth_value as usize)
                             .with_context(|| format!("No child at index {}", nth_value))?;
-                        let new_child_widget = build_gtk_widget(
-                            tree,
-                            widget_defs.clone(),
-                            custom_widget_invocation.scope,
-                            nth_child_widget_use.clone(),
-                            None,
-                        )?;
+                        let new_child_widget =
+                            build_gtk_widget(tree, widget_defs.clone(), scope, nth_child_widget_use.clone(), None)?;
                         child_container.children().iter().for_each(|f| child_container.remove(f));
                         child_container.set_child(Some(&new_child_widget));
                         new_child_widget.show();
@@ -323,7 +321,7 @@ fn build_children_special_widget(
         )?;
     } else {
         for child in &custom_widget_invocation.children {
-            let child_widget = build_gtk_widget(tree, widget_defs.clone(), custom_widget_invocation.scope, child.clone(), None)?;
+            let child_widget = build_gtk_widget(tree, widget_defs.clone(), scope, child.clone(), None)?;
             gtk_container.add(&child_widget);
         }
     }