Preserve QExcell auto filters in XLSX

src/io/excellOffice.test.ts

@@ -3,6 +3,7 @@ import JSZip from "jszip";
 import {
   buildChartXml,
   buildCellXml,
+  buildAutoFilterXml,
   buildHyperlinksXml,
   buildMergeCellsXml,
   buildSheetViewsXml,
@@ -16,6 +17,7 @@ import {
   workbookActiveSheetId,
   workbookRelationshipTargets,
   workbookSheetRefs,
+  worksheetXmlToAutoFilter,
   worksheetXmlToCells,
   worksheetXmlToCellFormats,
   worksheetXmlToFrozenPane,
@@ -643,6 +645,42 @@ describe("excellOffice OOXML helpers", () => {
     expect(imported.sheets[0].frozenPane).toEqual({ columns: 1, rows: 1, topLeftCell: "B2", activePane: "bottomRight" });
   });
 
+  it("читает и записывает автофильтр XLSX через autoFilter ref", async () => {
+    expect(
+      worksheetXmlToAutoFilter({
+        worksheet: {
+          autoFilter: { ref: "$D$20:$A$1" }
+        }
+      })
+    ).toBe("A1:D20");
+    expect(buildAutoFilterXml("B2:B2")).toBe('<autoFilter ref="B2"/>');
+    expect(buildAutoFilterXml("bad")).toBe("");
+
+    const blob = await exportXlsxBlob({
+      id: "book-1",
+      title: "AutoFilter.xlsx",
+      updatedAt: "2026-06-01T00:00:00.000Z",
+      activeSheet: "sheet-1",
+      sheets: [
+        {
+          id: "sheet-1",
+          name: "Filter",
+          autoFilter: "D20:A1",
+          mergedCells: [{ start: "A22", end: "D22" }],
+          cells: { A1: "Product", D20: "Total" }
+        }
+      ]
+    });
+    const zip = await JSZip.loadAsync(await blob.arrayBuffer());
+    const sheetXml = (await zip.file("xl/worksheets/sheet1.xml")?.async("string")) ?? "";
+    const imported = await importXlsxFile(new File([blob], "AutoFilter.xlsx", { type: blob.type }));
+
+    expect(sheetXml).toContain('<autoFilter ref="A1:D20"/>');
+    expect(sheetXml.indexOf("<sheetData>")).toBeLessThan(sheetXml.indexOf("<autoFilter"));
+    expect(sheetXml.indexOf("<autoFilter")).toBeLessThan(sheetXml.indexOf("<mergeCells"));
+    expect(imported.sheets[0].autoFilter).toBe("A1:D20");
+  });
+
   it("создает OOXML chart part для диаграммы XLSX", () => {
     const xml = buildChartXml(
       {