perf(ui): avoid full pane mode reads for scrollbars (#2554)

1 files changed, 10 insertions, 0 deletions

diff --git a/src/pane/terminal.rs b/src/pane/terminal.rs
index a6e5c1da..1c10726c 100644
--- a/src/pane/terminal.rs
+++ b/src/pane/terminal.rs
@@ -388,6 +388,10 @@ impl PaneTerminal {
         self.ghostty.input_state()
     }
 
+    pub fn alternate_screen_active(&self) -> bool {
+        self.ghostty.alternate_screen_active()
+    }
+
     pub fn wheel_routing(&self) -> Option<crate::pane::WheelRouting> {
         self.ghostty.wheel_routing()
     }
@@ -1665,6 +1669,12 @@ impl GhosttyPaneTerminal {
         core.kitty_keyboard.replay_ansi()
     }
 
+    pub fn alternate_screen_active(&self) -> bool {
+        self.core.lock().is_ok_and(|core| {
+            core.terminal.active_screen().ok() == Some(crate::ghostty::ActiveScreen::Alternate)
+        })
+    }
+
     pub fn input_state(&self) -> Option<InputState> {
         let Ok(core) = self.core.lock() else {
             return None;