master -> main

Author: domesticmouse

firebase-get-to-know-flutter/steps/index.lab.md

@@ -318,7 +318,7 @@ Flutter on macOS builds fully sandboxed apps. As this app integrates with the
 network to communicate with the Firebase servers, you need to configure your app
 with network client privileges.
 
-#### [macos/Runner/DebugProfile.entitlements](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_04/macos/Runner/DebugProfile.entitlements)
+#### [macos/Runner/DebugProfile.entitlements](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_04/macos/Runner/DebugProfile.entitlements)
 
 ```xml
 <?xml version="1.0" encoding="UTF-8"?>
@@ -338,7 +338,7 @@ with network client privileges.
 </plist>
 ```
 
-#### [macos/Runner/Release.entitlements](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_04/macos/Runner/Release.entitlements)
+#### [macos/Runner/Release.entitlements](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_04/macos/Runner/Release.entitlements)
 
 ```xml
 <?xml version="1.0" encoding="UTF-8"?>
@@ -377,7 +377,7 @@ widgets:
 
 1. Create a new file named `app_state.dart` with the following content:
 
-#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_05/lib/app_state.dart#L1)
+#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_05/lib/app_state.dart#L1)
 
 ```dart
 import 'package:firebase_auth/firebase_auth.dart'
@@ -432,7 +432,7 @@ package, which is a great way to quickly bootstrap login screens in your apps.
 
 1.  Modify the imports at the top of the `lib/main.dart` file:
 
-#### [lib/main.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_05/lib/main.dart#L1)
+#### [lib/main.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_05/lib/main.dart#L1)
 
 ```dart
 import 'package:firebase_ui_auth/firebase_ui_auth.dart'; // new
@@ -447,7 +447,7 @@ import 'home_page.dart';
 
 2. Connect the app state with the app initialization and then add the authentication flow to `HomePage`:
 
-#### [lib/main.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_05/lib/main.dart#L14)
+#### [lib/main.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_05/lib/main.dart#L14)
 
 ```dart
 void main() {
@@ -471,7 +471,7 @@ to redisplay dependent widgets.
 3.  Update your app to handle navigation to different screens that `FirebaseUI`
     provides for you, by creating a `GoRouter` configuration:
 
-#### [lib/main.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_05/lib/main.dart#L23)
+#### [lib/main.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_05/lib/main.dart#L23)
 
 ```dart
 // Add GoRouter configuration outside the App class
@@ -584,7 +584,7 @@ different screen, such as profile.
 4.  In the `HomePage` class's build method, integrate the app state with the
     `AuthFunc` widget:
 
-#### [lib/home_page.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_05/lib/home_page.dart#L14)
+#### [lib/home_page.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_05/lib/home_page.dart#L14)
 
 ```dart
 import 'package:firebase_auth/firebase_auth.dart' // new
@@ -699,7 +699,7 @@ that connects these elements with the database.
 1.  Create a new file named `guest_book.dart`, add a `GuestBook` stateful widget
     to construct the UI elements of a message field and a send button:
 
-#### [lib/guest_book.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_06/lib/guest_book.dart)
+#### [lib/guest_book.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_06/lib/guest_book.dart)
 
 ```dart
 import 'dart:async';
@@ -820,7 +820,7 @@ auto-generated unique ID that Authentication gives for all logged-in users.
 -   In the `lib/app_state.dart` file, add the `addMessageToGuestBook` method.
     You connect this capability with the user interface in the next step.
 
-#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_06/lib/app_state.dart#L41)
+#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_06/lib/app_state.dart#L41)
 
 ```dart
 import 'package:cloud_firestore/cloud_firestore.dart'; // new
@@ -864,7 +864,7 @@ is connect the two.
 -   In the `lib/home_page.dart` file, make the following change to the
     `HomePage` widget:
 
-#### [lib/home_page.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_06/lib/home_page.dart#L15)
+#### [lib/home_page.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_06/lib/home_page.dart#L15)
 
 ```dart
 import 'package:firebase_auth/firebase_auth.dart'
@@ -972,7 +972,7 @@ state that listens for newly added messages from the app.
 1.  Create a new file `guest_book_message.dart`, add the following class to
     expose a structured view of the data that you store in Firestore.
 
-#### [lib/guest_book_message.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_07/lib/guest_book_message.dart)
+#### [lib/guest_book_message.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_07/lib/guest_book_message.dart)
 
 ```dart
 class GuestBookMessage {
@@ -985,7 +985,7 @@ class GuestBookMessage {
 
 2. In the `lib/app_state.dart` file, add the following imports:
 
-#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_07/lib/app_state.dart#L1)
+#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_07/lib/app_state.dart#L1)
 
 ```dart
 import 'dart:async';                                     // new
@@ -1003,7 +1003,7 @@ import 'guest_book_message.dart';                        // new
 
 3. In section of `ApplicationState` where you define state and getters, add the following lines:
 
-#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_07/lib/app_state.dart#L22)
+#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_07/lib/app_state.dart#L22)
 
 ```dart
   bool _loggedIn = false;
@@ -1018,7 +1018,7 @@ import 'guest_book_message.dart';                        // new
 
 4. In the initialization section of `ApplicationState`, add the following lines to subscribe to a query over the document collection when a user logs in and unsubscribe when they log out:
 
-#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_07/lib/app_state.dart#L29)
+#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_07/lib/app_state.dart#L29)
 
 ```dart
   Future<void> init() async {
@@ -1072,7 +1072,7 @@ import 'guest_book_message.dart';
 
 6. In the `GuestBook` widget, add a list of messages as part of the configuration to connect this changing state to the user interface:
 
-#### [lib/guest_book.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_07/lib/guest_book.dart#L12)
+#### [lib/guest_book.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_07/lib/guest_book.dart#L12)
 
 ```dart
 class GuestBook extends StatefulWidget {
@@ -1093,7 +1093,7 @@ class GuestBook extends StatefulWidget {
 
 7. In `_GuestBookState`, modify the `build` method as follows to expose this configuration:
 
-#### [lib/guest_book.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_07/lib/guest_book.dart#L26)
+#### [lib/guest_book.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_07/lib/guest_book.dart#L26)
 
 ```dart
 class _GuestBookState extends State<GuestBook> {
@@ -1168,7 +1168,7 @@ generate a new `Paragraph` for each message in the list of messages.
 8.  Update the body of `HomePage` to correctly construct `GuestBook` with the
     new `messages` parameter:
 
-#### [lib/home_page.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_07/lib/home_page.dart#L48)
+#### [lib/home_page.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_07/lib/home_page.dart#L48)
 
 ```dart
 Consumer<ApplicationState>(
@@ -1314,7 +1314,7 @@ of how many people are attending.
     section of the `ApplicationState` so that the UI code can interact with this
     state:
 
-#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_09/lib/app_state.dart#L37)
+#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_09/lib/app_state.dart#L37)
 
 ```dart
 int _attendees = 0;
@@ -1337,7 +1337,7 @@ set attending(Attending attending) {
 
 2. Update the `ApplicationState`'s `init()` method as follows:
 
-#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_09/lib/app_state.dart#L80)
+#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_09/lib/app_state.dart#L80)
 
 ```dart
   Future<void> init() async {
@@ -1415,7 +1415,7 @@ whether the user is attending.
 
 3.  Add the following enumeration at the top of the `lib/app_state.dart` file.
 
-#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_09/lib/app_state.dart#L5)
+#### [lib/app_state.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_09/lib/app_state.dart#L5)
 
 ```dart
 enum Attending { yes, no, unknown }
@@ -1424,7 +1424,7 @@ enum Attending { yes, no, unknown }
 4.  Create a new file `yes_no_selection.dart`, define a new widget that acts
     like radio buttons:
 
-#### [lib/yes_no_selection.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_09/lib/yes_no_selection.dart)
+#### [lib/yes_no_selection.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_09/lib/yes_no_selection.dart)
 
 ```dart
 import 'package:flutter/material.dart';
@@ -1506,7 +1506,7 @@ rendering.
     enable a logged-in user to nominate whether they're attending, and display
     the number of attendees for the event:
 
-#### [lib/home_page.dart](https://github.com/flutter/codelabs/blob/master/firebase-get-to-know-flutter/step_09/lib/home_page.dart#L56)
+#### [lib/home_page.dart](https://github.com/flutter/codelabs/blob/main/firebase-get-to-know-flutter/step_09/lib/home_page.dart#L56)
 
 ```dart
 Consumer<ApplicationState>(