Use Inter in simple theme as well, if referenced

Avalonia.sln

@@ -237,8 +237,6 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Avalonia.Controls.ItemsRepe
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Avalonia.Controls.ItemsRepeater.UnitTests", "tests\Avalonia.Controls.ItemsRepeater.UnitTests\Avalonia.Controls.ItemsRepeater.UnitTests.csproj", "{F4E36AA8-814E-4704-BC07-291F70F45193}"
 EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Themes", "Themes", "{5D6AECCA-3700-4F9A-8A52-5DD56CA41CDC}"
-EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Avalonia.Fonts.Inter", "src\Avalonia.Fonts.Inter\Avalonia.Fonts.Inter.csproj", "{13F1135D-BA1A-435C-9C5B-A368D1D63DE4}"
 EndProject
 Global
@@ -634,9 +632,6 @@ Global
 		{75C47156-C5D8-44BC-A5A7-E8657C2248D6} = {9B9E3891-2366-4253-A952-D08BCEB71098}
 		{C810060E-3809-4B74-A125-F11533AF9C1B} = {9B9E3891-2366-4253-A952-D08BCEB71098}
 		{F4E36AA8-814E-4704-BC07-291F70F45193} = {C5A00AC3-B34C-4564-9BDD-2DA473EF4D8B}
-		{C42D2FC1-A531-4ED4-84B9-89AEC7C962FC} = {5D6AECCA-3700-4F9A-8A52-5DD56CA41CDC}
-		{3E10A5FA-E8DA-48B1-AD44-6A5B6CB7750F} = {5D6AECCA-3700-4F9A-8A52-5DD56CA41CDC}
-		{13F1135D-BA1A-435C-9C5B-A368D1D63DE4} = {5D6AECCA-3700-4F9A-8A52-5DD56CA41CDC}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {87366D66-1391-4D90-8999-95A620AD786A}

src/Avalonia.Themes.Simple/Accents/Base.xaml

@@ -71,6 +71,7 @@
       <SolidColorBrush x:Key="RefreshVisualizerBackground" Color="Transparent" />
     </ResourceDictionary>
   </ResourceDictionary.ThemeDictionaries>
+  <FontFamily x:Key="ContentControlThemeFontFamily">avares://Avalonia.Fonts.Inter/Assets#Inter, $Default</FontFamily>
   <Color x:Key="ThemeAccentColor">#CC119EDA</Color>
   <Color x:Key="ThemeAccentColor2">#99119EDA</Color>
   <Color x:Key="ThemeAccentColor3">#66119EDA</Color>

src/Avalonia.Themes.Simple/Controls/EmbeddableControlRoot.xaml

@@ -5,6 +5,7 @@
     <Setter Property="Foreground" Value="{DynamicResource ThemeForegroundBrush}" />
     <Setter Property="Background" Value="{DynamicResource ThemeBackgroundBrush}" />
     <Setter Property="FontSize" Value="{DynamicResource FontSizeNormal}" />
+    <Setter Property="FontFamily" Value="{DynamicResource ContentControlThemeFontFamily}" />
     <Setter Property="Template">
       <ControlTemplate>
         <Panel>

src/Avalonia.Themes.Simple/Controls/OverlayPopupHost.xaml

@@ -4,9 +4,7 @@
                 TargetType="OverlayPopupHost">
     <Setter Property="Foreground" Value="{DynamicResource ThemeForegroundBrush}" />
     <Setter Property="FontSize" Value="{DynamicResource FontSizeNormal}" />
-    <Setter Property="FontFamily" Value="{x:Static FontFamily.Default}" />
-    <Setter Property="FontWeight" Value="400" />
-    <Setter Property="FontStyle" Value="Normal" />
+    <Setter Property="FontFamily" Value="{DynamicResource ContentControlThemeFontFamily}" />
     <Setter Property="Template">
       <ControlTemplate>
         <!--  Do not forget to update Templated_Control_With_Popup_In_Template_Should_Set_TemplatedParent test  -->

src/Avalonia.Themes.Simple/Controls/PopupRoot.xaml

@@ -6,9 +6,7 @@
     <Setter Property="TransparencyLevelHint" Value="Transparent" />
     <Setter Property="Foreground" Value="{DynamicResource ThemeForegroundBrush}" />
     <Setter Property="FontSize" Value="{DynamicResource FontSizeNormal}" />
-    <Setter Property="FontFamily" Value="{x:Static FontFamily.Default}" />
-    <Setter Property="FontWeight" Value="400" />
-    <Setter Property="FontStyle" Value="Normal" />
+    <Setter Property="FontFamily" Value="{DynamicResource ContentControlThemeFontFamily}" />
     <Setter Property="Template">
       <ControlTemplate>
         <LayoutTransformControl LayoutTransform="{TemplateBinding Transform}">

src/Avalonia.Themes.Simple/Controls/Window.xaml

@@ -2,6 +2,7 @@
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
   <ControlTheme x:Key="{x:Type Window}"
                 TargetType="Window">
+    <Setter Property="FontFamily" Value="{DynamicResource ContentControlThemeFontFamily}" />
     <Setter Property="Background" Value="{DynamicResource ThemeBackgroundBrush}" />
     <Setter Property="TransparencyBackgroundFallback" Value="{DynamicResource HighlightForegroundColor}" />
     <Setter Property="Foreground" Value="{DynamicResource ThemeForegroundBrush}" />