Bug 1613801 - Don't include brand name in the window title on Mac. r=fluent-reviewers,flod,Gijs

Differential Revision: https://phabricator.services.mozilla.com/D62391

--HG--
extra : moz-landing-system : lando

browser/base/content/tabbrowser.js

@@ -973,10 +973,12 @@
 
       if (title) {
         return {
-          id: "browser-main-window-content-title",
+          id:
+            mode == "private"
+              ? "browser-main-window-content-title-private"
+              : "browser-main-window-content-title-default",
           args: {
             title,
-            mode,
           },
         };
       }

browser/locales/en-US/browser/browser.ftl

@@ -18,21 +18,32 @@ browser-main-window-title = { $mode ->
        *[default] { -brand-full-name }
     }
 
-# This is the default window title in case there is a content
-# title to be displayed.
-#
-# Depending on the $mode, the string will look like this (in en-US):
-#
-# "default" - "Example Title - Mozilla Firefox"
-# "private" - "Example Title - Mozilla Firefox (Private Browsing)"
-#
-# Variables
-#   $mode (String) - "private" in case of a private browsing mode, "default" otherwise.
-#   $title (String) - Content title string.
-browser-main-window-content-title = { $mode ->
-        [private] { $title } - { -brand-full-name } (Private Browsing)
-       *[default] { $title } - { -brand-full-name }
-    }
+## This is the default window title in case there is content
+## title to be displayed.
+##
+## On macOS the title doesn't include the brand name, on all other
+## platforms it does.
+##
+## For example, in private mode on Windows, the title will be:
+## "Example Title - Mozilla Firefox (Private Browsing)"
+##
+## while on macOS in default mode it will be:
+## "Example Title"
+##
+## Variables
+##   $title (String) - Content title string.
+
+browser-main-window-content-title-default = { PLATFORM() ->
+    [macos] { $title }
+   *[other] { $title } - { -brand-full-name }
+}
+
+browser-main-window-content-title-private = { PLATFORM() ->
+    [macos] { $title } - (Private Browsing)
+   *[other] { $title } - { -brand-full-name } (Private Browsing)
+}
+
+##
 
 urlbar-identity-button =
     .aria-label = View site information

python/l10n/fluent_migrations/bug_1613801_window_title_mac.py

@@ -0,0 +1,31 @@
+# coding=utf8
+
+# Any copyright is dedicated to the Public Domain.
+# http://creativecommons.org/publicdomain/zero/1.0/
+
+from __future__ import absolute_import
+import fluent.syntax.ast as FTL
+from fluent.migrate.helpers import transforms_from
+
+
+def migrate(ctx):
+    """Bug 1613801 - Don't include brand name in the window title on Mac., part {index}."""
+
+    ctx.add_transforms(
+        'browser/browser/browser.ftl',
+        'browser/browser/browser.ftl',
+        transforms_from(
+"""
+browser-main-window-content-title-default = { PLATFORM() ->
+    [macos] { $title }
+   *[other] { $title } - { -brand-full-name }
+}
+
+browser-main-window-content-title-private = { PLATFORM() ->
+    [macos] { $title } - {COPY(from_path, "mainWindow.titlePrivateBrowsingSuffix", trim:"True")}
+   *[other] { $title } - { -brand-full-name } {COPY(from_path, "mainWindow.titlePrivateBrowsingSuffix", trim:"True")}
+}
+""", from_path="browser/chrome/browser/browser.dtd")
+    )
+
+