Bug 1704065 - Don't start navigation swipe gestures where there is no navigation history. r=spohl

Apparently we should check each command specified by
browser.gesture.swipe.left or browser.gesture.swipe.right, it will be fixed
in bug 1707118.

Differential Revision: https://phabricator.services.mozilla.com/D113635

browser/base/content/browser-gestureSupport.js

@@ -250,7 +250,7 @@ var gGestureSupport = {
         : aEvent.DIRECTION_LEFT;
     }
 
-    return true;
+    return canGoBack || canGoForward;
   },
 
   /**

browser/base/content/test/gesture/.eslintrc.js

+"use strict";
+
+module.exports = {
+  extends: ["plugin:mozilla/browser-test"],
+};

browser/base/content/test/gesture/browser.ini

+[browser_gesture_navigation.js]

browser/base/content/test/gesture/browser_gesture_navigation.js

+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+add_task(async () => {
+  // Open a new browser window to make sure there is no navigation history.
+  const newBrowser = await BrowserTestUtils.openNewBrowserWindow({});
+
+  let event = {
+    direction: SimpleGestureEvent.DIRECTION_LEFT,
+  };
+  ok(!newBrowser.gGestureSupport._shouldDoSwipeGesture(event));
+
+  event = {
+    direction: SimpleGestureEvent.DIRECTION_RIGHT,
+  };
+  ok(!newBrowser.gGestureSupport._shouldDoSwipeGesture(event));
+
+  await BrowserTestUtils.closeWindow(newBrowser);
+});

browser/base/moz.build

@@ -28,6 +28,7 @@ BROWSER_CHROME_MANIFESTS += [
     "content/test/forms/browser.ini",
     "content/test/fullscreen/browser.ini",
     "content/test/general/browser.ini",
+    "content/test/gesture/browser.ini",
     "content/test/historySwipeAnimation/browser.ini",
     "content/test/keyboard/browser.ini",
     "content/test/menubar/browser.ini",