2 files changed, 59 insertions, 0 deletions
diff --git a/toolkit/components/printing/tests/browser.ini b/toolkit/components/printing/tests/browser.ini
new file mode 100644
index 000000000..88d6bb454
--- /dev/null
+++ b/toolkit/components/printing/tests/browser.ini
@@ -0,0 +1,2 @@
+[browser_page_change_print_original.js]
+skip-if = os == "mac"
diff --git a/toolkit/components/printing/tests/browser_page_change_print_original.js b/toolkit/components/printing/tests/browser_page_change_print_original.js
new file mode 100644
index 000000000..5990a486b
--- /dev/null
+++ b/toolkit/components/printing/tests/browser_page_change_print_original.js
@@ -0,0 +1,57 @@
+/**
+ * Verify that if the page contents change after print preview is initialized,
+ * and we re-initialize print preview (e.g. by changing page orientation),
+ * we still show (and will therefore print) the original contents.
+ */
+add_task(function* pp_after_orientation_change() {
+  const DATA_URI = `data:text/html,<script>window.onafterprint = function() { setTimeout("window.location = 'data:text/plain,REPLACED PAGE!'", 0); }</script><pre>INITIAL PAGE</pre>`;
+  // Can only do something if we have a print preview UI:
+  if (AppConstants.platform != "win" && AppConstants.platform != "linux") {
+    ok(true, "Can't test if there's no print preview.");
+    return;
+  }
+
+  // Ensure we get a browserStopped for this browser
+  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, DATA_URI, false, true);
+  let browserToPrint = tab.linkedBrowser;
+  let ppBrowser = PrintPreviewListener.getPrintPreviewBrowser();
+
+  // Get a promise now that resolves when the original tab's location changes.
+  let originalTabNavigated = BrowserTestUtils.browserStopped(browserToPrint);
+
+  // Enter print preview:
+  let printPreviewEntered = BrowserTestUtils.waitForMessage(ppBrowser.messageManager, "Printing:Preview:Entered");
+  document.getElementById("cmd_printPreview").doCommand();
+  yield printPreviewEntered;
+
+  // Assert that we are showing the original page
+  yield ContentTask.spawn(ppBrowser, null, function* () {
+    is(content.document.body.textContent, "INITIAL PAGE", "Should have initial page print previewed.");
+  });
+
+  yield originalTabNavigated;
+
+  // Change orientation and wait for print preview to re-enter:
+  let orient = PrintUtils.getPrintSettings().orientation;
+  let orientToSwitchTo = orient != Ci.nsIPrintSettings.kPortraitOrientation ?
+    "portrait" : "landscape";
+  let printPreviewToolbar = document.querySelector("toolbar[printpreview=true]");
+
+  printPreviewEntered = BrowserTestUtils.waitForMessage(ppBrowser.messageManager, "Printing:Preview:Entered");
+  printPreviewToolbar.orient(orientToSwitchTo);
+  yield printPreviewEntered;
+
+  // Check that we're still showing the original page.
+  yield ContentTask.spawn(ppBrowser, null, function* () {
+    is(content.document.body.textContent, "INITIAL PAGE", "Should still have initial page print previewed.");
+  });
+
+  // Check that the other tab is definitely showing the new page:
+  yield ContentTask.spawn(browserToPrint, null, function* () {
+    is(content.document.body.textContent, "REPLACED PAGE!", "Original page should have changed.");
+  });
+
+  PrintUtils.exitPrintPreview();
+
+  yield BrowserTestUtils.removeTab(tab);
+});