[FIX] clipboard: escape cell content

Escape cell content to avoid rendering the cell content as html when copy-pasting
Task: 6214316

Author: fdamhaut

src/plugins/ui_stateful/clipboard.ts

@@ -27,7 +27,7 @@ import { Command, CommandResult, isCoreCommand, LocalCommand } from "../../types
 import { FileStore } from "../../types/files";
 import { Dimension, HeaderIndex, UID, Zone } from "../../types/misc";
 import { GridRenderingContext } from "../../types/rendering";
-import { xmlEscape } from "../../xlsx/helpers/xml_helpers";
+import { escapeXml, xmlEscape } from "../../xlsx/helpers/xml_helpers";
 import { UIPlugin, UIPluginConfig } from "../ui_plugin";
 
 export const MAX_FILE_SIZE = 5 * 1024 * 1024; // 5 MB
@@ -593,7 +593,7 @@ export class ClipboardPlugin extends UIPlugin {
         innerHTML = "\t";
       }
     } else if (cells.length === 1 && cells[0].length === 1) {
-      innerHTML = `${this.getters.getCellText(cells[0][0].position)}`;
+      innerHTML = escapeXml`${this.getters.getCellText(cells[0][0].position)}`.toString();
     } else if (!cells[0][0]) {
       return "";
     } else {