Preserve QOutlook HTML EML bodies

src/io/outlookMail.test.ts

@@ -7,6 +7,7 @@ import {
   decodeTransferBody,
   extractMessageAttachments,
   extractMessageBody,
+  extractMessageHtmlBody,
   htmlToPlainText,
   importEmlFile,
   isSupportedEmlFileName,
@@ -203,6 +204,7 @@ describe("outlookMail helpers", () => {
 
     expect(imported.subject).toBe("Мультипарт");
     expect(imported.body).toBe("Привет, письмо");
+    expect(imported.bodyHtml).toBe("<p>HTML</p>");
     expect(imported.from).toBe("sender@example.com");
     expect(imported.to).toBe("reader@example.com");
     expect(imported.cc).toBe("copy@example.com");
@@ -298,11 +300,13 @@ describe("outlookMail helpers", () => {
       xPriority: "5",
       priority: "non-urgent",
       subject: "MSG отчет",
+      bodyHtml: "<p>HTML&nbsp;текст</p>",
       body: "HTML текст",
       time: "Mon, 01 Jun 2026 10:00:00 GMT",
       read: false,
       flagged: false
     });
+    expect(message.bodyHtml).toBe("<p>HTML&nbsp;текст</p>");
     expect(message.id).toMatch(/^msg-/);
     expect(message.attachments).toEqual([
       {
@@ -355,6 +359,28 @@ describe("outlookMail helpers", () => {
     expect(eml.endsWith("Текст")).toBe(true);
   });
 
+  it("exports HTML body as multipart/alternative EML", () => {
+    const message: MailMessage = {
+      id: "html-1",
+      folder: "sent",
+      from: "sender@example.com",
+      to: "reader@example.com",
+      subject: "HTML message",
+      body: "Plain text",
+      bodyHtml: "<p><strong>HTML text</strong></p>",
+      time: "Mon, 01 Jan 2024 10:00:00 +0000",
+      read: true,
+      flagged: false
+    };
+
+    const eml = buildEmlSource(message);
+    const parsed = parseEmlSource(eml);
+
+    expect(eml).toContain("Content-Type: multipart/alternative");
+    expect(extractMessageBody(parsed.headers, parsed.body)).toBe("Plain text");
+    expect(extractMessageHtmlBody(parsed.headers, parsed.body)).toBe("<p><strong>HTML text</strong></p>");
+  });
+
   it("собирает multipart/mixed EML с вложениями и RFC 2231 filename", () => {
     const message: MailMessage = {
       id: "1",
@@ -372,6 +398,7 @@ describe("outlookMail helpers", () => {
       priority: "urgent",
       subject: "Тема",
       body: "Текст",
+      bodyHtml: "<p><strong>Текст</strong></p>",
       time: "Mon, 01 Jan 2024 10:00:00 +0000",
       read: true,
       flagged: false,
@@ -392,6 +419,7 @@ describe("outlookMail helpers", () => {
     const attachments = extractMessageAttachments(parsed.headers, parsed.body);
 
     expect(eml).toContain("Content-Type: multipart/mixed");
+    expect(eml).toContain("Content-Type: multipart/alternative");
     expect(eml).toContain("Cc: copy@example.com");
     expect(eml).toContain("Bcc: hidden@example.com");
     expect(eml).toContain("Reply-To: support@example.com");
@@ -403,6 +431,7 @@ describe("outlookMail helpers", () => {
     expect(eml).toContain("Priority: urgent");
     expect(eml).toContain("filename*=utf-8''%D0%BE%D1%82%D1%87%D0%B5%D1%82%2E%74%78%74");
     expect(extractMessageBody(parsed.headers, parsed.body)).toBe("Текст");
+    expect(extractMessageHtmlBody(parsed.headers, parsed.body)).toBe("<p><strong>Текст</strong></p>");
     expect(attachments[0]).toMatchObject({
       fileName: "отчет.txt",
       contentType: "text/plain",