Poll only visible web surfaces

crates/ely_browser_core/src/state.rs

@@ -36,6 +36,7 @@ mod tab_lifecycle;
 mod tab_order;
 mod tab_selection;
 mod tabs;
+mod visible_content;
 
 pub use bookmarks::{
     BookmarkImportSummary, ELYBOOKMARKS_FILE_EXTENSION, ELYBOOKMARKS_SCHEMA_VERSION,

crates/ely_browser_core/src/state/visible_content.rs

@@ -0,0 +1,22 @@
+use ely_domain::TabId;
+
+use super::BrowserCore;
+use crate::CoreError;
+
+impl BrowserCore {
+    pub fn visible_content_tab_ids(&self) -> Result<Vec<TabId>, CoreError> {
+        let active_tab = self.active_tab()?;
+        let Some(split_id) = active_tab.split_id() else {
+            return Ok(vec![active_tab.id().clone()]);
+        };
+        let layout = self
+            .split_layouts
+            .iter()
+            .find(|layout| layout.id() == split_id)
+            .ok_or_else(|| CoreError::SplitNotFound { id: split_id.clone() })?;
+        if layout.pane_count() < 2 {
+            return Ok(vec![active_tab.id().clone()]);
+        }
+        Ok(layout.panes().iter().map(|pane| pane.tab_id().clone()).collect())
+    }
+}