From c2dc47c1178d67b07d82b920ff76654d5054109a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?flora=20=7E=20=F0=9F=8F=B3=EF=B8=8F=E2=80=8D=E2=9A=A7?=
 =?UTF-8?q?=EF=B8=8F=20=E2=9D=A4=20=F0=9F=A6=80?=
 <35181375+tascord@users.noreply.github.com>
Date: Fri, 15 Nov 2024 14:18:38 +1100
Subject: [PATCH] Fix over-scrollback-ing, and allow third parties to determine
 if scroll back should be actionable

---
 src/grid.rs   | 6 +++++-
 src/screen.rs | 4 ++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/grid.rs b/src/grid.rs
index fc236bc..b3b1770 100644
--- a/src/grid.rs
+++ b/src/grid.rs
@@ -63,6 +63,10 @@ impl Grid {
         self.size
     }
 
+    pub fn row_count(&self) -> usize {
+        self.rows.len()
+    }
+
     pub fn set_size(&mut self, size: Size) {
         if size.cols != self.size.cols {
             for row in &mut self.rows {
@@ -122,7 +126,7 @@ impl Grid {
         self.scrollback
             .iter()
             .skip(scrollback_len - self.scrollback_offset)
-            .chain(self.rows.iter().take(rows_len - self.scrollback_offset))
+            .chain(self.rows.iter().take(rows_len.saturating_sub(self.scrollback_offset)))
     }
 
     pub fn drawing_rows(&self) -> impl Iterator<Item = &crate::row::Row> {
diff --git a/src/screen.rs b/src/screen.rs
index 73b904e..64609c1 100644
--- a/src/screen.rs
+++ b/src/screen.rs
@@ -107,6 +107,10 @@ impl Screen {
             .set_size(crate::grid::Size { rows, cols });
     }
 
+    pub fn scrollback_rows(&self) -> usize {
+        self.grid.row_count()
+    }
+
     /// Returns the current size of the terminal.
     ///
     /// The return value will be (rows, cols).