Preserve QPowerPoint hidden slides in PPTX

src/io/powerPointOffice.test.ts

@@ -307,6 +307,47 @@ describe("powerPointOffice helpers", () => {
     expect(exportedSlideXml).toContain("FCE4D6");
   });
 
+  it("импортирует и экспортирует скрытые слайды PPTX через атрибут show", async () => {
+    const zip = new JSZip();
+    zip.file(
+      "ppt/presentation.xml",
+      `<p:presentation xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"><p:sldIdLst><p:sldId id="256" r:id="rId1"/></p:sldIdLst></p:presentation>`
+    );
+    zip.file(
+      "ppt/_rels/presentation.xml.rels",
+      `<Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"><Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slide" Target="slides/slide1.xml"/></Relationships>`
+    );
+    zip.file("ppt/slides/slide1.xml", slideXmlWithShow("Скрытый слайд", "0"));
+
+    const importedBlob = await zip.generateAsync({
+      type: "blob",
+      mimeType: "application/vnd.openxmlformats-officedocument.presentationml.presentation"
+    });
+    const imported = await importPptxFile(new File([importedBlob], "Скрытый.pptx", { type: importedBlob.type }));
+
+    expect(imported.slides[0]).toMatchObject({ title: "Скрытый слайд", hidden: true });
+
+    const exportedBlob = await exportPptxBlob({
+      title: "Скрытый.pptx",
+      slides: [
+        {
+          id: "slide-1",
+          title: "Скрытый слайд",
+          subtitle: "",
+          notes: "",
+          theme: "classic",
+          hidden: true
+        }
+      ]
+    });
+    const exportedZip = await JSZip.loadAsync(await exportedBlob.arrayBuffer());
+    const exportedSlideXml = (await exportedZip.file("ppt/slides/slide1.xml")?.async("string")) ?? "";
+    const reimported = await importPptxFile(new File([exportedBlob], "Скрытый.pptx", { type: exportedBlob.type }));
+
+    expect(exportedSlideXml).toContain('show="0"');
+    expect(reimported.slides[0].hidden).toBe(true);
+  });
+
   it("импортирует и экспортирует цвет и размер текста слайда", async () => {
     const zip = new JSZip();
     zip.file(
@@ -380,6 +421,10 @@ function slideXmlWithBackground(title: string, color: string) {
   return `<p:sld xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><p:cSld><p:bg><p:bgPr><a:solidFill><a:srgbClr val="${color}"/></a:solidFill></p:bgPr></p:bg><p:spTree><p:sp><p:txBody><a:p><a:r><a:t>${title}</a:t></a:r></a:p></p:txBody></p:sp></p:spTree></p:cSld></p:sld>`;
 }
 
+function slideXmlWithShow(title: string, show: string) {
+  return `<p:sld show="${show}" xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><p:cSld><p:spTree><p:sp><p:txBody><a:p><a:r><a:t>${title}</a:t></a:r></a:p></p:txBody></p:sp></p:spTree></p:cSld></p:sld>`;
+}
+
 function slideXmlWithTextStyles(title: string, subtitle: string) {
   return `<p:sld xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><p:cSld><p:spTree><p:sp><p:txBody><a:p><a:r><a:rPr sz="3400"><a:solidFill><a:srgbClr val="C2410C"/></a:solidFill><a:latin typeface="Courier New"/></a:rPr><a:t>${title}</a:t></a:r></a:p></p:txBody></p:sp><p:sp><p:txBody><a:p><a:r><a:rPr sz="2200"><a:solidFill><a:srgbClr val="0F766E"/></a:solidFill><a:latin typeface="Times New Roman"/></a:rPr><a:t>${subtitle}</a:t></a:r></a:p></p:txBody></p:sp></p:spTree></p:cSld></p:sld>`;
 }