From 1afffba1d8bed670401fbef2391d2fb4de4c1c78 Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Mon, 4 Nov 2019 11:00:19 -0800
Subject: [PATCH] Only refresh rows that changed during parsing

Fixes #2534
---
 src/InputHandler.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/InputHandler.ts b/src/InputHandler.ts
index 7b6ea1fe..74208482 100644
--- a/src/InputHandler.ts
+++ b/src/InputHandler.ts
@@ -347,6 +347,9 @@ export class InputHandler extends Disposable implements IInputHandler {
       }
     }
 
+    // Clear the dirty row service so we know which lines changed as a result of parsing
+    this._dirtyRowService.clearRange();
+
     // process big data in smaller chunks
     if (data.length > MAX_PARSEBUFFER_LENGTH) {
       for (let i = 0; i < data.length; i += MAX_PARSEBUFFER_LENGTH) {
@@ -367,6 +370,8 @@ export class InputHandler extends Disposable implements IInputHandler {
     if (buffer.x !== cursorStartX || buffer.y !== cursorStartY) {
       this._onCursorMove.fire();
     }
+
+    // Refresh any dirty rows accumulated as part of parsing
     this._terminal.refresh(this._dirtyRowService.start, this._dirtyRowService.end);
   }