Fix #7519 - Reset fb and depth buffer Ids once they are deleted

[odalet]

What does the pull request do?

This fixes issue #7519 (artifacts appearing in OpenGLControlBase when hidden then shown again)

What is the current behavior?

See this video:

Before.mp4

What is the updated/expected behavior with this PR?

No artifacts when hiding/showing again the control

How was the solution implemented (if it's not obvious)?

• Simply resetted the depth buffer id to 0 when it is deleted
• Note: I did the same with the framebuffer id. Although not strictly necessary, I thought it'd be better for consistency purpose.

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/Documentation with user documentation

None of these, but here is a video of the behavior after the fix:

After.mp4

Breaking changes

None

Obsoletions / Deprecations

None

Fixed issues

[avaloniaui-team]

You can test this PR using the following package version. 0.10.999-cibuild0018489-beta. (feed url: https://nuget.avaloniaui.net/repository/avalonia-all/index.json) [PRBUILDID]

[avaloniaui-team]

You can test this PR using the following package version. 0.10.999-cibuild0018491-beta. (feed url: https://nuget.avaloniaui.net/repository/avalonia-all/index.json) [PRBUILDID]