From c3d35fcea9c38bfdff99dab2df6cc049e505c97d Mon Sep 17 00:00:00 2001
From: Daniel Imms <2193314+Tyriar@users.noreply.github.com>
Date: Mon, 1 Jun 2026 20:27:15 -0700
Subject: [PATCH] fix(InputHandler): clear wrap below scroll margins after
 column ops

scrollLeft, scrollRight, insertColumns, and deleteColumns set
isWrapped=false on every line inside the scroll margins but left
the first line below scrollBottom unchanged. A soft wrap spanning
the bottom margin and the next row could leave a stale isWrapped
flag on the line below, breaking wrapped string translation.

Clear isWrapped on the buffer line below the bottom margin after
each of these column operations.

Co-authored-by: Cursor <cursoragent@cursor.com>
---
 src/common/InputHandler.ts | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/common/InputHandler.ts b/src/common/InputHandler.ts
index 94a6401d3..ade09ff51 100644
--- a/src/common/InputHandler.ts
+++ b/src/common/InputHandler.ts
@@ -1202,6 +1202,21 @@ export class InputHandler extends Disposable implements IInputHandler {
     }
   }
 
+  /**
+   * Scroll-margin column operations clear isWrapped on lines inside the margins.
+   * Also clear the line below the bottom margin when it still continues a wrap chain.
+   */
+  private _clearWrapBelowScrollMargins(): void {
+    const rowBelowMargin = this._activeBuffer.scrollBottom + 1;
+    if (rowBelowMargin >= this._bufferService.rows) {
+      return;
+    }
+    const lineBelow = this._activeBuffer.lines.get(this._activeBuffer.ybase + rowBelowMargin);
+    if (lineBelow) {
+      lineBelow.isWrapped = false;
+    }
+  }
+
   /**
    * CSI Ps J  Erase in Display (ED).
    *     Ps = 0  -> Erase Below (default).
@@ -1521,6 +1536,7 @@ export class InputHandler extends Disposable implements IInputHandler {
       line.deleteCells(0, param, this._activeBuffer.getNullCell(this._eraseAttrData()));
       line.isWrapped = false;
     }
+    this._clearWrapBelowScrollMargins();
     this._dirtyRowTracker.markRangeDirty(this._activeBuffer.scrollTop, this._activeBuffer.scrollBottom);
     return true;
   }
@@ -1554,6 +1570,7 @@ export class InputHandler extends Disposable implements IInputHandler {
       line.insertCells(0, param, this._activeBuffer.getNullCell(this._eraseAttrData()));
       line.isWrapped = false;
     }
+    this._clearWrapBelowScrollMargins();
     this._dirtyRowTracker.markRangeDirty(this._activeBuffer.scrollTop, this._activeBuffer.scrollBottom);
     return true;
   }
@@ -1577,6 +1594,7 @@ export class InputHandler extends Disposable implements IInputHandler {
       line.insertCells(this._activeBuffer.x, param, this._activeBuffer.getNullCell(this._eraseAttrData()));
       line.isWrapped = false;
     }
+    this._clearWrapBelowScrollMargins();
     this._dirtyRowTracker.markRangeDirty(this._activeBuffer.scrollTop, this._activeBuffer.scrollBottom);
     return true;
   }
@@ -1600,6 +1618,7 @@ export class InputHandler extends Disposable implements IInputHandler {
       line.deleteCells(this._activeBuffer.x, param, this._activeBuffer.getNullCell(this._eraseAttrData()));
       line.isWrapped = false;
     }
+    this._clearWrapBelowScrollMargins();
     this._dirtyRowTracker.markRangeDirty(this._activeBuffer.scrollTop, this._activeBuffer.scrollBottom);
     return true;
   }