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())
+    }
+}

crates/ely_browser_core/tests/splits.rs

@@ -25,6 +25,31 @@ fn split_right_creates_two_pane_layout() -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
+#[test]
+fn visible_content_tab_ids_returns_active_tab_without_split() -> Result<(), Box<dyn Error>> {
+    let core = BrowserCore::new(InitialBrowserConfig::ely_defaults()?)?;
+    let active_tab_id = core.active_tab()?.id().clone();
+
+    assert_eq!(core.visible_content_tab_ids()?, vec![active_tab_id]);
+    Ok(())
+}
+
+#[test]
+fn visible_content_tab_ids_returns_split_panes() -> Result<(), Box<dyn Error>> {
+    let mut core = BrowserCore::new(InitialBrowserConfig::ely_defaults()?)?;
+    let split_id = core.split_active_tab_right()?;
+    let snapshot = core.snapshot()?;
+    let layout = snapshot
+        .split_layouts
+        .iter()
+        .find(|layout| layout.id() == &split_id)
+        .ok_or("missing split layout")?;
+    let pane_ids = layout.panes().iter().map(|pane| pane.tab_id().clone()).collect::<Vec<_>>();
+
+    assert_eq!(core.visible_content_tab_ids()?, pane_ids);
+    Ok(())
+}
+
 #[test]
 fn split_right_command_focuses_new_pane() -> Result<(), Box<dyn Error>> {
     let mut core = BrowserCore::new(InitialBrowserConfig::ely_defaults()?)?;