Introdcue font collections

[Gillibald]

What does the pull request do?

This PR introduces font collection to be able to manage the lifetime of created glyph typefaces and to be able to load fonts from custom sources. As long as it is possible to obtain a stream of the font file it can be loaded.

Fonts within font collections are referenced via FontFamily="fonts:CollectionName#FamilyName"

What is the current behavior?

What is the updated/expected behavior with this PR?

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

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

Breaking changes

Obsoletions / Deprecations

Fixed issues

[avaloniaui-team]

You can test this PR using the following package version. 11.0.999-cibuild0031071-beta. (feed url: https://pkgs.dev.azure.com/AvaloniaUI/AvaloniaUI/_packaging/avalonia-all/nuget/v3/index.json) [PRBUILDID]

[avaloniaui-team]

You can test this PR using the following package version. 11.0.999-cibuild0031294-beta. (feed url: https://pkgs.dev.azure.com/AvaloniaUI/AvaloniaUI/_packaging/avalonia-all/nuget/v3/index.json) [PRBUILDID]

[avaloniaui-team]

You can test this PR using the following package version. 11.0.999-cibuild0031330-beta. (feed url: https://pkgs.dev.azure.com/AvaloniaUI/AvaloniaUI/_packaging/avalonia-all/nuget/v3/index.json) [PRBUILDID]

[maxkatz6]

@Gillibald tests are randomly failing because of this PR:

02:11:33 [ERR] [xUnit.net 00:00:06.11]     Avalonia.Controls.UnitTests.TimePickerTests.SelectedTimeChanged_Should_Fire_When_SelectedTime_Set [FAIL]
02:11:33 [DBG]   Failed Avalonia.Controls.UnitTests.TimePickerTests.SelectedTimeChanged_Should_Fire_When_SelectedTime_Set [1 ms]
02:11:33 [DBG]   Error Message:
02:11:33 [DBG]    System.InvalidOperationException : Unable to locate 'Avalonia.Platform.IAssetLoader'.
02:11:33 [DBG]   Stack Trace:
02:11:33 [DBG]      at Avalonia.LocatorExtensions.GetRequiredService[T](IAvaloniaDependencyResolver resolver) in /_/src/Avalonia.Base/AvaloniaLocator.cs:line 136
02:11:33 [DBG]    at Avalonia.Media.Fonts.EmbeddedFontCollection.Initialize(IFontManagerImpl fontManager) in /_/src/Avalonia.Base/Media/Fonts/EmbeddedFontCollection.cs:line 36
02:11:33 [DBG]    at Avalonia.Media.FontManager.TryGetGlyphTypeface(Typeface typeface, IGlyphTypeface& glyphTypeface) in /_/src/Avalonia.Base/Media/FontManager.cs:line 112
02:11:33 [DBG]    at Avalonia.Media.Typeface.get_GlyphTypeface() in /_/src/Avalonia.Base/Media/Typeface.cs:line 87
0

Seems like IAssetLoader needs to be registered in the scope of each of these tests. It passes probably only if loader was registered by some another test (which is also a problem, as all locator registrations in tests should be done in locator scope and cleared after the test).

[maxkatz6]

Or a mock of asset loader should be registered.

[danwalmsley]

Locally on mac and windows that unit test doesnt not cause any jobs to be posted to the dispatcher.

Only randomly sometimes on CI does it happen.

2023-03-03T12:09:36.8964822Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Controls.TextBlock.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/TextBlock.cs:line 707�[0m
2023-03-03T12:09:36.8966875Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Base/Layout/Layoutable.cs:line 532�[0m
2023-03-03T12:09:36.8968840Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Base/Layout/Layoutable.cs:line 364�[0m
2023-03-03T12:09:36.8971073Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Layout.LayoutHelper.MeasureChild(Layoutable control, Size availableSize, Thickness padding, Thickness borderThickness) in /_/src/Avalonia.Base/Layout/LayoutHelper.cs:line 47�[0m
2023-03-03T12:09:36.8974848Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Controls.Presenters.ContentPresenter.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Presenters/ContentPresenter.cs:line 591�[0m
2023-03-03T12:09:36.8977443Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in /_/src/Avalonia.Base/Layout/Layoutable.cs:line 532�[0m
2023-03-03T12:09:36.8979590Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Layout.Layoutable.Measure(Size availableSize) in /_/src/Avalonia.Base/Layout/Layoutable.cs:line 364�[0m
2023-03-03T12:09:36.8981543Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Layout.LayoutManager.Measure(Layoutable control) in /_/src/Avalonia.Base/Layout/LayoutManager.cs:line 294�[0m
2023-03-03T12:09:36.8983558Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Layout.LayoutManager.Measure(Layoutable control) in /_/src/Avalonia.Base/Layout/LayoutManager.cs:line 280�[0m
2023-03-03T12:09:36.8985534Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Layout.LayoutManager.ExecuteMeasurePass() in /_/src/Avalonia.Base/Layout/LayoutManager.cs:line 254�[0m
2023-03-03T12:09:36.8987558Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Layout.LayoutManager.InnerLayoutPass() in /_/src/Avalonia.Base/Layout/LayoutManager.cs:line 236�[0m
2023-03-03T12:09:36.8989548Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Layout.LayoutManager.ExecuteLayoutPass() in /_/src/Avalonia.Base/Layout/LayoutManager.cs:line 148�[0m
2023-03-03T12:09:36.8991527Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Layout.LayoutManager.ExecuteQueuedLayoutPass() in /_/src/Avalonia.Base/Layout/LayoutManager.cs:line 108�[0m
2023-03-03T12:09:36.8993508Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Threading.JobRunner.Job.Avalonia.Threading.JobRunner.IJob.Run() in /_/src/Avalonia.Base/Threading/JobRunner.cs:line 193�[0m
2023-03-03T12:09:36.8995535Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Threading.JobRunner.RunJobs(Nullable`1 priority) in /_/src/Avalonia.Base/Threading/JobRunner.cs:line 38�[0m
2023-03-03T12:09:36.8997314Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Threading.Dispatcher.RunJobs() in /_/src/Avalonia.Base/Threading/Dispatcher.cs:line 69�[0m
2023-03-03T12:09:36.8999498Z �[90m12:09:36�[0m�[90m [�[0m�[97;1mDBG�[0m�[90m] �[0m   at Avalonia.Controls.UnitTests.TimePickerTests.SelectedTimeChanged_Should_Fire_When_SelectedTime_Set() in D:\a\1\s\tests\Avalonia.Controls.UnitTests\TimePickerTests.cs:line 28�[0m

so this code path never happens.

What would make that code path execute?

using (UnitTestApplication.Start(Services))
            {
                bool handled = false;
                TimePicker timePicker = new TimePicker();
                timePicker.SelectedTimeChanged += (s, e) =>
                {
                    handled = true;
                };
                TimeSpan value = TimeSpan.FromHours(10);
                timePicker.SelectedTime = value;
                Threading.Dispatcher.UIThread.RunJobs();
                Assert.True(handled);
            }
            ```