better regexp, fix offset issue in #4294

src/browser/renderer/dom/DomRenderer.ts

@@ -38,7 +38,7 @@ export class DomRenderer extends Disposable implements IRenderer {
   private _rowContainer: HTMLElement;
   private _rowElements: HTMLElement[] = [];
   private _selectionContainer: HTMLElement;
-  private _cellToRowElements: Uint16Array[] = [];
+  private _cellToRowElements: Int16Array[] = [];
 
   public dimensions: IRenderDimensions;
 
@@ -361,7 +361,7 @@ export class DomRenderer extends Disposable implements IRenderer {
       const lineData = this._bufferService.buffer.lines.get(row);
       const cursorStyle = this._optionsService.rawOptions.cursorStyle;
       if (!this._cellToRowElements[y] || this._cellToRowElements[y].length !== this._bufferService.cols) {
-        this._cellToRowElements[y] = new Uint16Array(this._bufferService.cols);
+        this._cellToRowElements[y] = new Int16Array(this._bufferService.cols);
       }
       rowElement.replaceChildren(this._rowFactory.createRow(lineData!, row, row === cursorAbsoluteY, cursorStyle, cursorX, cursorBlink, this.dimensions.css.cell.width, this._bufferService.cols, this._cellToRowElements[y]));
     }

src/browser/renderer/dom/DomRendererRowFactory.test.ts

@@ -14,7 +14,7 @@ import { MockCoreService, MockDecorationService, MockOptionsService } from 'comm
 import { css } from 'common/Color';
 import { MockCharacterJoinerService, MockCoreBrowserService, MockThemeService } from 'browser/TestUtils.test';
 
-const EMPTY_ELEM_MAPPING = new Uint16Array(1000);
+const EMPTY_ELEM_MAPPING = new Int16Array(1000);
 
 describe('DomRendererRowFactory', () => {
   let dom: jsdom.JSDOM;

src/browser/renderer/dom/DomRendererRowFactory.ts

@@ -49,7 +49,7 @@ export class DomRendererRowFactory {
     this._columnSelectMode = columnSelectMode;
   }
 
-  public createRow(lineData: IBufferLine, row: number, isCursorRow: boolean, cursorStyle: string | undefined, cursorX: number, cursorBlink: boolean, cellWidth: number, cols: number, cellMap: Uint16Array): DocumentFragment {
+  public createRow(lineData: IBufferLine, row: number, isCursorRow: boolean, cursorStyle: string | undefined, cursorX: number, cursorBlink: boolean, cellWidth: number, cols: number, cellMap: Int16Array): DocumentFragment {
     // NOTE: `cellMap` maps cell positions to a span element index in a row.
     // All positions should be updated, even skipped ones after wide chars or left overs at the end,
     // otherwise the mouse hover logic might mark the wrong elements as underlined.
@@ -316,7 +316,7 @@ export class DomRendererRowFactory {
     // since the loop above might exit early not handling all cells,
     // also set remaining cell positions to last element index
     if (x < cols - 1) {
-      cellMap.subarray(x + 1).fill(elemIndex);
+      cellMap.subarray(x).fill(++elemIndex);
     }
 
     return fragment;