From a19b05f8139754069fdd2bf0387b6111f92905ac Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Mon, 8 Jan 2018 09:53:06 -0800
Subject: [PATCH] Fix bad type check that caused rows to not refresh

---
 src/utils/RenderDebouncer.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/utils/RenderDebouncer.ts b/src/utils/RenderDebouncer.ts
index c494fb98..5a9c93d6 100644
--- a/src/utils/RenderDebouncer.ts
+++ b/src/utils/RenderDebouncer.ts
@@ -24,8 +24,8 @@ export class RenderDebouncer implements IDisposable {
   public refresh(rowStart?: number, rowEnd?: number): void {
     rowStart = rowStart || 0;
     rowEnd = rowEnd || this._terminal.rows - 1;
-    this._rowStart = this._rowStart ? Math.min(this._rowStart, rowStart) : rowStart;
-    this._rowEnd = this._rowEnd ? Math.max(this._rowEnd, rowEnd) : rowEnd;
+    this._rowStart = this._rowStart !== null ? Math.min(this._rowStart, rowStart) : rowStart;
+    this._rowEnd = this._rowEnd !== null ? Math.max(this._rowEnd, rowEnd) : rowEnd;
 
     if (this._animationFrame) {
       return;