Update learning index YAML files for consistency (#12505)

- Fix a few keys that had a null/missing value causing issues for some
YAML parsers.
- Keep descriptions <= 80 characters by consistently breaking them
across lines.
- A few minor capitalization fixes.

Author: parlough

src/_data/learning-resources-index/demos.yml

@@ -1,5 +1,6 @@
 - name: Add-to-app
-  description: Recommended approaches for adding Flutter to existing apps.
+  description: >-
+    Recommended approaches for adding Flutter to existing apps.
   tags:
     - platforms
     - iOS
@@ -10,7 +11,9 @@
     label: Flutter Github
 
 - name: Android splash screen
-  description:
+  description: >-
+    A Flutter sample app that exemplifies how to implement an
+    animated splash screen for Android devices.
   tags:
     - Android
   type: demo
@@ -19,16 +22,19 @@
     label: Flutter Github
 
 - name: iOS app clip
-  description:
+  description: >-
+    A sample project demonstrating integration with iOS App Clip.
   tags:
     - iOS
   type: demo
   link:
     url: https://github.com/flutter/samples/tree/main/ios_app_clip
     label: Flutter Github
 
-- name: Swift Platform view
-  description: A Flutter sample app that combines a native iOS UIViewController with a full-screen Flutter view.
+- name: Swift platform view
+  description: >-
+    A Flutter sample app that combines a native iOS UIViewController with
+    a full-screen Flutter view.
   tags:
     - swift
     - ios
@@ -37,9 +43,12 @@
     url: https://github.com/flutter/samples/tree/main/platform_view_swift
     label: Flutter Github
 
-- name: Simplistic Editor
-  description: This sample text editor showcases the use of TextEditingDeltas and a DeltaTextInputClient to expand and contract styled ranges of text.
+- name: Simplistic editor
+  description: >-
+    This sample text editor showcases the use of TextEditingDeltas and
+    a DeltaTextInputClient to expand and contract styled ranges of text.
   tags:
+    - text
   type: quickstart
   link:
     url: https://github.com/flutter/samples/tree/main/simplistic_editor

src/_data/learning-resources-index/quickstarts_dart.yml

@@ -1,5 +1,6 @@
-- name: Command line app
-  description: A command line app that parses command-line options and fetches from GitHub.
+- name: Command-line app
+  description: >-
+    A command line app that parses command-line options and fetches from GitHub.
   tags:
     - cli
     - Dart
@@ -9,7 +10,8 @@
     label: Dart Github
 
 - name: Extension methods
-  description: Demonstrates Dart's extensions method syntax.
+  description: >-
+    Demonstrates Dart's extensions method syntax.
   tags:
     - syntax
     - Dart
@@ -19,7 +21,8 @@
     label: Dart Github
 
 - name: FFI
-  description: A series of simple examples demonstrating how to call C libraries from Dart.
+  description: >-
+    A series of simple examples demonstrating how to call C libraries from Dart.
   tags:
     - platforms
     - Dart
@@ -29,7 +32,9 @@
     label: Dart Github
 
 - name: Isolates (in a CLI)
-  description: Command line applications that demonstrate how to work with Concurrency in Dart using isolates.
+  description: >-
+    Command line applications that demonstrate how to
+    work with Concurrency in Dart using isolates.
   tags:
     - cli
     - Dart
@@ -39,7 +44,9 @@
     label: Dart Github
 
 - name: Native Dart app
-  description: A command line application that can be compiled to native code using `dart compile exe`.
+  description: >-
+    A command line application that can be compiled to
+    native code using `dart compile exe`.
   tags:
     - cli
     - Dart
@@ -49,7 +56,8 @@
     label: Dart Github
 
 - name: Server side Dart
-  description: Examples of running Dart on the server.
+  description: >-
+    Examples of running Dart on the server.
   tags:
     - cli
     - Dart
@@ -59,7 +67,8 @@
     label: Dart Github
 
 - name: Package constraint solver
-  description: Demonstrates best-practices for publishing packages on pub.dev.
+  description: >-
+    Demonstrates best-practices for publishing packages on pub.dev.
   tags:
     - pub
     - Dart

src/_data/learning-resources-index/quickstarts_flutter.yml

@@ -1,5 +1,6 @@
 - name: Asset transformation
-  description: Demonstrates how to transform images' color scales and formats.
+  description: >-
+    Demonstrates how to transform images' color scales and formats.
   tags:
     - images
     - UI
@@ -9,7 +10,8 @@
     label: Flutter Github
 
 - name: Background isolate channels
-  description: Demonstrates how to use long-lived isolates.
+  description: >-
+    Demonstrates how to use long-lived isolates.
   tags:
     - performance
   type: quickstart
@@ -18,15 +20,21 @@
     label: Flutter Github
 
 - name: Code sharing
-  description: Demonstrates how to share business logic between Flutter client and Dart server using `package:shelf`.
+  description: >-
+    Demonstrates how to share business logic between a
+    Flutter client and Dart server using `package:shelf`.
   tags:
+    - Dart
   type: quickstart
   link:
     url: https://github.com/flutter/samples/tree/main/code_sharing
     label: Flutter Github
-    
+
 - name: Context menus
-  description: This sample shows how to create and customize cross-platform context menus, such as the text selection toolbar on mobile or the right click menu on desktop.
+  description: >-
+    This sample shows how to create and customize cross-platform context menus,
+    such as the text selection toolbar on mobile or
+    the right click menu on desktop.
   tags:
     - macos
     - windows
@@ -36,7 +44,8 @@
     label: Flutter Github
 
 - name: Desktop UI
-  description: Demonstrates desktop features in both Material and FluentUI design systems.
+  description: >-
+    Demonstrates desktop features in both Material and FluentUI design systems.
   tags:
     - material
     - macos
@@ -47,7 +56,9 @@
     label: Flutter Github
 
 - name: AI generated dynamic theme
-  description: Demonstrates how to call on-device Flutter APIs based on output from the Gemini API.
+  description: >-
+    Demonstrates how to call on-device Flutter APIs based on
+    output from the Gemini API.
   tags:
     - AI
     - google
@@ -57,7 +68,8 @@
     label: Flutter Github
 
 - name: Form app
-  description: A sample demonstrating different types of forms and best practices.
+  description: >-
+    A sample demonstrating different types of forms and best practices.
   tags:
     - input
     - layout
@@ -67,7 +79,9 @@
     label: Flutter Github
 
 - name: AI todo list
-  description: A developer sample written in Flutter demonstrating how to interact with a to-do list in natural language using the Gemini API.
+  description: >-
+    A developer sample written in Flutter demonstrating how to
+    interact with a to-do list in natural language using the Gemini API.
   tags:
     - AI
     - google
@@ -77,7 +91,8 @@
     label: Flutter Github
 
 - name: Google Maps plugin
-  description: Demonstrates the Google Maps for Flutter plugin.
+  description: >-
+    Demonstrates the Google Maps for Flutter plugin.
   tags:
     - google
     - maps
@@ -87,7 +102,9 @@
     label: Flutter Github
 
 - name: Infinite list
-  description: A Flutter sample app that shows an implementation of the 'infinite list' UX pattern.
+  description: >-
+    A Flutter sample app that shows an implementation of
+    the 'infinite list' UX pattern.
   tags:
     - lists
     - layout
@@ -98,7 +115,9 @@
     label: Flutter Github
 
 - name: Isolates
-  description: A sample application that demonstrate best practices when using isolates.
+  description: >-
+    A sample application that
+    demonstrate best practices when using isolates.
   tags:
     - isolates
     - perf
@@ -109,7 +128,9 @@
     label: Flutter Github
 
 - name: Navigation and routing
-  description: A sample that shows how to use `go_router` API to handle common navigation scenarios.
+  description: >-
+    A sample that shows how to use `go_router` API to
+    handle common navigation scenarios.
   tags:
     - navigation
     - routing
@@ -119,7 +140,8 @@
     label: Flutter Github
 
 - name: Google Maps Flutter plugin
-  description: A sample place tracking app that uses the google_apps_flutter plugin.
+  description: >-
+    A sample place tracking app that uses the google_apps_flutter plugin.
   tags:
     - maps
     - google
@@ -130,7 +152,10 @@
     label: Flutter Github
 
 - name: Platform adaptive design
-  description: This sample project shows a Flutter app that maximizes application code reuse while adhering to different design patterns on Android and iOS.
+  description: >-
+    This sample project shows a Flutter app that
+    maximizes application code reuse while adhering to
+    different design patterns on Android and iOS.
   tags:
     - adaptive
     - design
@@ -140,7 +165,9 @@
     label: Flutter Github
 
 - name: Counter app with Provider
-  description: The starter Flutter application, but using the Provider package to manage state.
+  description: >-
+    The starter Flutter application, but
+    using the Provider package to manage state.
   tags:
     - state management
     - architecture
@@ -150,7 +177,9 @@
     label: Flutter Github
 
 - name: Shopping app with Provider
-  description: A Flutter sample app that shows a state management approach using the Provider package.
+  description: >-
+    A Flutter sample app that shows a
+    state management approach using the Provider package.
   tags:
     - state management
     - architecture
@@ -160,7 +189,8 @@
     label: Flutter Github
 
 - name: Simple shaders
-  description: A simple Flutter fragment shaders project.
+  description: >-
+    A simple Flutter fragment shaders project.
   tags:
     - shaders
     - gpu
@@ -170,7 +200,8 @@
     label: Flutter Github
 
 - name: Desktop calculator
-  description: A calculator sample to demonstrate a simple start for a desktop Flutter app.
+  description: >-
+    A calculator sample to demonstrate a simple start for a desktop Flutter app.
   tags:
     - desktop
   type: quickstart
@@ -179,7 +210,8 @@
     label: Flutter Github
 
 - name: Testing app
-  description: A sample app that shows different types of testing in Flutter.
+  description: >-
+    A sample app that shows different types of testing in Flutter.
   tags:
     - testing
   type: quickstart
@@ -188,7 +220,10 @@
     label: Flutter Github
 
 - name: Web element embedding
-  description: Modifies the index.html of a flutter app so it is launched in a custom hostElement. This is the most basic embedding example.
+  description: >-
+    Modifies the index.html of a flutter app so it
+    is launched in a custom hostElement.
+    This is the most basic embedding example.
   tags:
     - web
   type: quickstart
@@ -197,7 +232,9 @@
     label: Flutter Github
 
 - name: ng-flutter
-  description: A simple Angular app (and component) that replicates the above example, but in an Angular style.
+  description: >-
+    A simple Angular app (and component) that
+    replicates the element embedding example, but in an Angular app.
   tags:
     - web
     - google
@@ -207,7 +244,9 @@
     label: Flutter Github
 
 - name: Platform channels
-  description: A sample Flutter app which demonstrates how to use `MethodChannel`, `EventChannel`, `BasicMessageChannel` and `MessageCodec`.
+  description: >-
+    A sample Flutter app which demonstrates how to use
+    `MethodChannel`, `EventChannel`, `BasicMessageChannel` and `MessageCodec`.
   tags:
     - platforms
     - android