Remove duplicate Flutter section and add example scripts

docs/building.md

@@ -9,10 +9,22 @@ Here you will find instructions on how to install the necessary tools for buildi
 - 100 GB of storage
 
 ## Linux host
+
 The following instructions are for building and running on a Linux host.  Alternatively, see the [Mac](#mac-host) and/or [Windows](#windows-host) section.  This entire section (except for the Android Studio section) needs to be completed in WSL if building on a Windows host.
 
 ### Flutter
-Install Flutter 3.19.6 by following these instructions: https://docs.flutter.dev/get-started/install/linux/desktop?tab=download#install-the-flutter-sdk.  You can also clone https://github.com/flutter/flutter, check out the `3.19.6` tag, and add its `flutter/bin` folder to your PATH.  Run `flutter doctor` in a terminal to confirm its installation.
+Install Flutter 3.19.6 by [following their guide](https://docs.flutter.dev/get-started/install/linux/desktop?tab=download#install-the-flutter-sdk).  You can also clone https://github.com/flutter/flutter, check out the `3.19.6` tag, and add its `flutter/bin` folder to your PATH as in
+```sh
+FLUTTER_DIR="$HOME/development/flutter"
+git clone https://github.com/flutter/flutter.git "$FLUTTER_DIR"
+cd "$FLUTTER_DIR"
+git checkout 3.16.9
+echo 'export PATH="$PATH:'"$FLUTTER_DIR"'/bin"' >> "$HOME/.profile"
+source "$HOME/.profile"
+flutter precache
+```
+
+Run `flutter doctor` in a terminal to confirm its installation.
 
 ### Android Studio
 Install Android Studio.  Follow instructions here [https://developer.android.com/studio/install#linux](https://developer.android.com/studio/install#linux) or install via snap:
@@ -38,17 +50,7 @@ The following *may* be needed for Android studio:
 sudo apt-get install libc6:i386 libncurses5:i386 libstdc++6:i386 lib32z1 libbz2-1.0:i386
 ```
 
-### Flutter
-
-Flutter and the Dart SDK should have been set up by Android studio, but if running `flutter` doesn't work (try `flutter doctor`, too), follow the [guide to install Flutter on any of their supported platforms](https://docs.flutter.dev/get-started/install) or:
- - `git clone https://github.com/flutter/flutter` somewhere it can live (`/var`, `/opt`, `~`)
- - `git checkout 3.16.0` after navigating into the `flutter` directory, and 
- - add `flutter/bin` to your PATH (on Ubuntu, add `PATH=$PATH:path/to/flutter/bin` to `~/.profile`).
-
-Run `flutter doctor` to install any missing dependencies and review and agree to any license agreements.
-
 ### Build dependencies
-
 Install basic dependencies
 ```
 sudo apt-get install libssl-dev curl unzip automake build-essential file pkg-config git python libtool libtinfo5 cmake libgit2-dev clang libncurses5-dev libncursesw5-dev zlib1g-dev llvm python3-distutils
@@ -221,7 +223,6 @@ cd scripts/macos
 ```
 
 ### Run prebuild script
-
 Certain test wallet parameter and API key template files must be created in order to run Stack Wallet.  These can be created by script as in
 ```
 cd scripts
@@ -247,6 +248,7 @@ flutter run macos
 ```
 
 ## Windows host
+
 ### Visual Studio
 Visual Studio is required for Windows development with the Flutter SDK.  Download it at https://visualstudio.microsoft.com/downloads/ and install the "Desktop development with C++", "Linux development with C++", and "Visual C++ build tools" workloads.  You may also need the Windows 10, 11, and/or Universal SDK workloads depending on your Windows version.
 
@@ -280,7 +282,18 @@ Copy the resulting `dll`s to their respective positions on the Windows host:
 Frostdart will be built by the Windows host later.
 
 ### Install Flutter on Windows host
-Install Flutter 3.19.6 on your Windows host (not in WSL2) by following these instructions: https://docs.flutter.dev/get-started/install/windows/desktop?tab=download#install-the-flutter-sdk.  You can also clone https://github.com/flutter/flutter, check out the `3.19.6` tag, and add its `flutter/bin` folder to your PATH.  Run `flutter doctor` in PowerShell to confirm its installation.
+Install Flutter 3.19.6 on your Windows host (not in WSL2) by [following their guide](https://docs.flutter.dev/get-started/install/windows/desktop?tab=download#install-the-flutter-sdk) or by cloning https://github.com/flutter/flutter, checking out the `3.19.6` tag, and adding its `flutter/bin` folder to your PATH as in
+```bat
+@echo off
+set "FLUTTER_DIR=%USERPROFILE%\development\flutter"
+git clone https://github.com/flutter/flutter.git "%FLUTTER_DIR%"
+cd /d "%FLUTTER_DIR%"
+git checkout 3.16.9
+setx PATH "%PATH%;%FLUTTER_DIR%\bin"
+echo Flutter setup completed. Please restart your command prompt.
+```
+
+Run `flutter doctor` in PowerShell to confirm its installation.
 
 ### Rust
 Install [Rust](https://www.rust-lang.org/tools/install) on the Windows host (not in WSL2).  Download the installer from [rustup.rs](https://rustup.rs), make sure it works on the commandline (you may need to open a new terminal), and install the following versions: