update avalonia to preview6 code.

Directory.Build.props

@@ -2,6 +2,6 @@
   <PropertyGroup>
     <LangVersion>latest</LangVersion>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
-    <AvaloniaVersion>0.10.0-preview5</AvaloniaVersion>
+    <AvaloniaVersion>0.10.999-cibuild0011494-beta</AvaloniaVersion>
   </PropertyGroup>
 </Project>

NuGet.config

@@ -2,7 +2,7 @@
 <configuration>
   <packageSources>
     <clear />
-    <add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
-    <add key="avalonia-ci" value="https://www.myget.org/F/avalonia-ci/api/v2" />
+    <add key="AvaloniaCI" value="https://nuget.avaloniaui.net/repository/avalonia-all/index.json" />
   </packageSources>
 </configuration>

src/AvaloniaEdit/Rendering/TextView.cs

@@ -1059,7 +1059,7 @@ namespace AvaloniaEdit.Rendering
             var properties = new TextRunProperties
             {
                 FontSize = FontSize,
-                Typeface = FontManager.Current.GetOrAddTypeface(TextBlock.GetFontFamily(this), TextBlock.GetFontStyle(this), TextBlock.GetFontWeight(this)),
+                Typeface = new Typeface(TextBlock.GetFontFamily(this), TextBlock.GetFontStyle(this), TextBlock.GetFontWeight(this)),
                 ForegroundBrush = TextBlock.GetForeground(this),
                 CultureInfo = CultureInfo.CurrentCulture
             };

src/AvaloniaEdit/Text/TextLineRun.cs

@@ -166,7 +166,7 @@ namespace AvaloniaEdit.Text
             var formattedText = new FormattedText
             {
                 Text = stringRange.ToString(),
-                Typeface = FontManager.Current.GetOrAddTypeface(tf.FontFamily, tf.Style, tf.Weight),
+                Typeface = new Typeface(tf.FontFamily, tf.Style, tf.Weight),
                 FontSize = run.FontSize
             };
        
@@ -200,7 +200,7 @@ namespace AvaloniaEdit.Text
                 var size = new FormattedText
                 {
                     Text = StringRange[i].ToString(),
-                    Typeface = FontManager.Current.GetOrAddTypeface(tf.FontFamily, tf.Style, tf.Weight),
+                    Typeface = new Typeface(tf.FontFamily, tf.Style, tf.Weight),
                     FontSize = FontSize
                 }.Bounds.Size;
                 

src/AvaloniaEdit/Utils/TextFormatterFactory.cs

@@ -59,7 +59,7 @@ namespace AvaloniaEdit.Utils
             var formattedText = new FormattedText
             {
                 Text = text,
-                Typeface = FontManager.Current.GetOrAddTypeface(typeface),
+                Typeface = new Typeface(typeface.Name),
 				FontSize = emSize.Value
             };