Bugfix #2967 - Change counter into boolean

[Mangepange]

Description of Change

Changed the integer counter for keeping track of Load and Unload events in SKXamlCanvas into a boolean.
This prevents issues when the Unload event comes before Load, and also when multiple Unload events are triggered (both of these situations arise due to WinUI issues).

(No added tests since I couldn't find any previous regarding the SKXamlCanvas)

Bugs Fixed

• Fixes [BUG] Multiple Unloaded events in WinUI causes empty SKXamlCanvas #2967

API Changes

None.

Behavioral Changes

None.

Required skia PR

None.

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Merged related skia PRs
• Changes adhere to coding standard
• Updated documentation

[github-actions]

📦 Try the packages from this PR

Warning

Do not run these scripts without first reviewing the code in this PR.

Step 1 — Download the packages

bash / macOS / Linux:

curl -fsSL https://raw.githubusercontent.com/mono/SkiaSharp/main/scripts/get-skiasharp-pr.sh | bash -s -- 4112

PowerShell / Windows:

iex "& { $(irm https://raw.githubusercontent.com/mono/SkiaSharp/main/scripts/get-skiasharp-pr.ps1) } 4112"

Step 2 — Add the local NuGet source

dotnet nuget add source ~/.skiasharp/hives/pr-4112/packages --name skiasharp-pr-4112

More options

Option	Description
--successful-only / -SuccessfulOnly	Only use successful builds
--force / -Force	Overwrite previously downloaded packages
--list / -List	List available artifacts without downloading
--build-id ID / -BuildId ID	Download from a specific build

Or download manually from Azure Pipelines — look for the nuget artifact on the build for this PR.

Remove the source when you're done:

dotnet nuget remove source skiasharp-pr-4112

[dotnet-policy-service]

Hey there @@Mangepange! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[Mangepange]

@dotnet-policy-service agree