Support strikethrough text style

src/browser/renderer/BaseRenderLayer.ts

@@ -152,6 +152,21 @@ export abstract class BaseRenderLayer implements IRenderLayer {
       height * this._scaledCellHeight);
   }
 
+  /**
+     * Fills a 1px line (2px on HDPI) at the middle of the cell. This uses the
+     * existing fillStyle on the context.
+     * @param x The column to fill.
+     * @param y The row to fill.
+     */
+  protected _fillMiddleLineAtCells(x: number, y: number, width: number = 1): void {
+    const cellOffset = Math.ceil(this._scaledCellHeight * 0.5);
+    this._ctx.fillRect(
+      x * this._scaledCellWidth,
+      (y + 1) * this._scaledCellHeight - cellOffset - window.devicePixelRatio,
+      width * this._scaledCellWidth,
+      window.devicePixelRatio);
+  }
+
   /**
    * Fills a 1px line (2px on HDPI) at the bottom of the cell. This uses the
    * existing fillStyle on the context.