From 6b2459317be4e472f3737146639f6df85182872f Mon Sep 17 00:00:00 2001
From: Per Bothner <per@bothner.com>
Date: Thu, 3 Aug 2023 22:29:36 -0700
Subject: [PATCH] Null out following columns after grapheme cluster

---
 src/common/InputHandler.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/common/InputHandler.ts b/src/common/InputHandler.ts
index 5d9147aa..7be2f1aa 100644
--- a/src/common/InputHandler.ts
+++ b/src/common/InputHandler.ts
@@ -600,7 +600,9 @@ export class InputHandler extends Disposable implements IInputHandler {
         // since an empty cell is only set by fullwidth chars
         bufferRow.addCodepointToCell(this._activeBuffer.x - offset,
           code, chWidth);
-        this._activeBuffer.x += chWidth - oldWidth;
+        for (let delta = chWidth - oldWidth; --delta >= 0; ) {
+          bufferRow.setCellFromCodePoint(this._activeBuffer.x++, 0, 0, curAttr.fg, curAttr.bg, curAttr.extended);
+        }
         continue;
       }