Fix config reload updating incorrect grid

CHANGELOG.md

@@ -54,6 +54,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Parser stopping at unknown DEC private modes/SGR character attributes
 - Block selection appending duplicate newlines when last column is selected
 - Bitmap fonts being a bit smaller than they should be in some cases
+- Config reload creating alternate screen history instead of updating scrollback
 
 ### Removed
 

alacritty_terminal/src/term/mod.rs

@@ -972,8 +972,13 @@ impl<T> Term<T> {
         }
         self.default_cursor_style = config.cursor.style;
         self.dynamic_title = config.dynamic_title();
+
+        if self.alt {
+            self.alt_grid.update_history(config.scrolling.history() as usize);
+        } else {
             self.grid.update_history(config.scrolling.history() as usize);
         }
+    }
 
     /// Convert the active selection to a String.
     pub fn selection_to_string(&self) -> Option<String> {