Updated Avalonia to 0.10.0-preview1

[jp2masa]

Changes

• Updated Avalonia to 0.10.0-preview1:
  • Updated default text color and font size:
    • Text color is now based on fluent theme resources (won't work for default theme, which I think will be deprecated soon anyway).
    • Font size is now constant 14.0f (this value comes from fluent theme resources, there is also a bug which blocks using the resource: it is double, but font size is float, probably a bug in Avalonia).
  • Updated Avalonia sample:
    • Also removed SideBar.xaml: the default styles for TabControl is good in fluent theme, also the side bar styles don't look good in fluent.

[Happypig375]

Font size is now constant 14.0f (this value comes from fluent theme resources, there is also a bug which blocks using the resource: it is double, but font size is float, probably a bug in Avalonia).

As noted in #121 (comment), this is also a problem for Platform Uno. The solution would be to change all float properties to double, but that change will be done in #121.

Also this value (14) would be great as the default across all platforms. The current default, 50, is definitely too large. I'll add a commit that implements this change.

[FoggyFinder]

I got System.InvalidOperationException: "The control already has a visual parent." while switching between themes.
Let's check whether it is an Avalonia bug or something on our side before merge

[Happypig375]

I think this is AvaloniaUI/Avalonia#4265.

[FoggyFinder]

To avoid crash I think it would be better to replace ComboBox here with ToggleSwitch or something like that

[FoggyFinder]

I tried to use ToggleSwitch but all my attempts are failed. Despite themes are replaced the toggle itself was remain on the same position. Unclear why.

Two RadioButton seems safest option :-)

I can do it in the evening if better solution won't be found.

[Happypig375]

Can the RadioButton text be vertically centered relative to the circles?