Improve logging to troubleshoot font loading

[ArtjomP]

What does the pull request do?

Improves logging in case of font loading errors.

What is the current behavior?

On font loading error you get a crash with the message: Could not create glyphTypeface.

What is the updated/expected behavior with this PR?

On font loading error you get a crash with the message with additional info to help fix the issue: Could not create glyphTypeface. Font family: (font family name). Style: style. Weight: weight. Stretch: stretch.

Checklist

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

Breaking changes

Obsoletions / Deprecations

Fixed issues

Fixes #13040

[ArtjomP]

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[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0046948-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0047040-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[Gillibald]

We should also add the source string of specified font family. Ideally these errors are covered by the compiler. So we try to resolve these font assets at compile time / design time.

We might as well just produce a log message and fallback to the default.

[ArtjomP]

Where can I get the source string of the specified font family from? The Typeface constructor has only fontFamilyName and I get it to the exception message via FontFamily?.Name.
It would be great if we get this error during compile time. Unfortunately, I have some customer reports that my software crashes at random times and I see #13040 (comment) this only unhandled exception in the log. And after updating MacOS to Sonoma one customer said that the app stopped crashing.
Even some clues would be helpful for me. And you're right having some substitute in such cases instead of crashes would be great. At least some more info in the log is better then nothing.

[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0047172-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

[Gillibald]

https://github.com/AvaloniaUI/Avalonia/blob/master/src/Avalonia.Base/Media/FontFamily.cs#L105
https://github.com/AvaloniaUI/Avalonia/blob/master/src/Avalonia.Base/Media/Fonts/FontFamilyKey.cs#L103

[ArtjomP]

Thank you! I've added the key. Its good that the FontFamilyKey has ToString() overridden.

[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0047176-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]