From 9b6c4e046f61c39470d9d7ed295df03d55dc68df Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Sat, 16 Sep 2017 10:57:49 -0700
Subject: [PATCH] Only refresh char atlas when char dimensions are valid

See Microsoft/vscode#34493
---
 src/renderer/BaseRenderLayer.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/renderer/BaseRenderLayer.ts b/src/renderer/BaseRenderLayer.ts
index 8f655de5..4cc07472 100644
--- a/src/renderer/BaseRenderLayer.ts
+++ b/src/renderer/BaseRenderLayer.ts
@@ -57,6 +57,9 @@ export abstract class BaseRenderLayer implements IRenderLayer {
    * @param colorSet The color set to use for the char atlas.
    */
   private _refreshCharAtlas(terminal: ITerminal, colorSet: IColorSet): void {
+    if (this._scaledCharWidth > 0 && this._scaledCharHeight > 0) {
+      return;
+    }
     this._charAtlas = null;
     const result = acquireCharAtlas(terminal, this._colors, this._scaledCharWidth, this._scaledCharHeight);
     if (result instanceof HTMLCanvasElement) {