From 44037fa42aa80002ce54f0a8e4a6203e3e12aaf5 Mon Sep 17 00:00:00 2001
From: Kirill Chibisov <wchibisovkirill@gmail.com>
Date: Sun, 22 Dec 2019 14:05:19 +0300
Subject: [PATCH] Fix crash on clear when scrolled up in history

Fixes #3112.
---
 CHANGELOG.md                       | 1 +
 alacritty_terminal/src/grid/mod.rs | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a8bd9a2..a7e6ddb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -33,6 +33,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Performance bottleneck when clearing colored rows
 - Vague startup crash messages on Windows with WinPTY backend
 - Deadlock on Windows when closing Alacritty using the title bar "X" button (ConPTY backend)
+- Crash on `clear` when scrolled up in history
 
 ## 0.4.0
 
diff --git a/alacritty_terminal/src/grid/mod.rs b/alacritty_terminal/src/grid/mod.rs
index ad9d9b7..a12c950 100644
--- a/alacritty_terminal/src/grid/mod.rs
+++ b/alacritty_terminal/src/grid/mod.rs
@@ -544,6 +544,9 @@ impl<T: GridCell + PartialEq + Copy> Grid<T> {
         let positions = self.lines - iter.cur.line;
         let region = Line(0)..self.num_lines();
 
+        // Reset display offset
+        self.display_offset = 0;
+
         // Clear the viewport
         self.scroll_up(&region, positions, template);