Fixed acrylic themes (#8026)

Author: yaira2

src/Files/Themes/Acrylic.xaml

@@ -13,6 +13,12 @@
             <Color x:Key="SolidBackgroundFillColorTertiary">#2D2D2D</Color>
 
             <!--  Acrylic Resources  -->
+            <AcrylicBrush
+                x:Key="RootBackgroundBrush"
+                BackgroundSource="HostBackdrop"
+                FallbackColor="{ThemeResource SolidBackgroundFillColorSecondary}"
+                TintColor="{ThemeResource SolidBackgroundFillColorSecondary}"
+                TintOpacity="0.65" />
             <AcrylicBrush
                 x:Key="HorizontalTabControlBackgroundBrush"
                 BackgroundSource="HostBackdrop"
@@ -99,6 +105,12 @@
             <x:Double x:Key="SidebarTintLuminosityOpacity">0.5</x:Double>
 
             <!--  Acrylic Resources  -->
+            <AcrylicBrush
+                x:Key="RootBackgroundBrush"
+                BackgroundSource="HostBackdrop"
+                FallbackColor="{ThemeResource SolidBackgroundFillColorSecondary}"
+                TintColor="{ThemeResource SolidBackgroundFillColorSecondary}"
+                TintOpacity="0.65" />
             <AcrylicBrush
                 x:Key="HorizontalTabControlBackgroundBrush"
                 BackgroundSource="HostBackdrop"

src/Files/Themes/Blue Acrylic.xaml

@@ -6,6 +6,12 @@
     <ResourceDictionary.ThemeDictionaries>
         <ResourceDictionary x:Key="Default">
             <!--  Acrylic Resources  -->
+            <AcrylicBrush
+                x:Key="RootBackgroundBrush"
+                BackgroundSource="HostBackdrop"
+                FallbackColor="{ThemeResource SolidBackgroundFillColorBase}"
+                TintColor="{ThemeResource SolidBackgroundFillColorBase}"
+                TintOpacity="0.75" />
             <AcrylicBrush
                 x:Key="SolidBackgroundFillColorBaseBrush"
                 BackgroundSource="HostBackdrop"
@@ -60,6 +66,12 @@
 
         <ResourceDictionary x:Key="Light">
             <!--  Acrylic Resources  -->
+            <AcrylicBrush
+                x:Key="RootBackgroundBrush"
+                BackgroundSource="HostBackdrop"
+                FallbackColor="{ThemeResource SolidBackgroundFillColorBase}"
+                TintColor="{ThemeResource SolidBackgroundFillColorBase}"
+                TintOpacity="0.75" />
             <AcrylicBrush
                 x:Key="SolidBackgroundFillColorBaseBrush"
                 BackgroundSource="HostBackdrop"

src/Files/Themes/Glass.xaml

@@ -7,7 +7,6 @@
         <ResourceDictionary x:Key="Default">
 
             <!--  Background Resources  -->
-            <SolidColorBrush x:Key="RootBackgroundBrush" Color="#AA020205" />
             <Color x:Key="SolidBackground">#020205</Color>
             <Color x:Key="SolidBackgroundFillColorBase">#020205</Color>
             <Color x:Key="SolidBackgroundFillColorSecondary">#111115</Color>
@@ -34,6 +33,12 @@
                 TintOpacity="0.5" />
 
             <!--  Tabs Area Background  -->
+            <AcrylicBrush
+                x:Key="RootBackgroundBrush"
+                BackgroundSource="HostBackdrop"
+                FallbackColor="{ThemeResource SolidBackgroundFillColorBase}"
+                TintColor="{ThemeResource SolidBackgroundFillColorBase}"
+                TintOpacity="0.5" />
             <AcrylicBrush
                 x:Key="HorizontalTabControlBackgroundBrush"
                 BackgroundSource="HostBackdrop"
@@ -89,7 +94,6 @@
         </ResourceDictionary>
         <ResourceDictionary x:Key="Light">
             <!--  Background Resources  -->
-            <SolidColorBrush x:Key="RootBackgroundBrush" Color="#AABBBBBC" />
             <Color x:Key="SolidBackground">#BBBBBC</Color>
             <Color x:Key="SolidBackgroundFillColorBase">#BBBBBC</Color>
             <Color x:Key="SolidBackgroundFillColorSecondary">#C9C9CA</Color>
@@ -121,6 +125,12 @@
                 FallbackColor="{ThemeResource SolidBackgroundFillColorBase}"
                 TintColor="{ThemeResource SolidBackgroundFillColorBase}"
                 TintOpacity="0.4" />
+            <AcrylicBrush
+                x:Key="RootBackgroundBrush"
+                BackgroundSource="HostBackdrop"
+                FallbackColor="{ThemeResource SolidBackgroundFillColorBase}"
+                TintColor="{ThemeResource SolidBackgroundFillColorBase}"
+                TintOpacity="0.4" />
 
             <!--  Tabs  -->
             <SolidColorBrush x:Key="TabViewItemHeaderBackground" Color="transparent" />

src/Files/Themes/Mica Imitation.xaml

@@ -29,6 +29,12 @@
                 TintOpacity="0.95" />
 
             <!--  Tabs Area Background  -->
+            <AcrylicBrush
+                x:Key="RootBackgroundBrush"
+                BackgroundSource="HostBackdrop"
+                FallbackColor="{ThemeResource SolidBackgroundFillColorSecondary}"
+                TintColor="{ThemeResource SolidBackgroundFillColorSecondary}"
+                TintOpacity="0.95" />
             <AcrylicBrush
                 x:Key="HorizontalTabControlBackgroundBrush"
                 BackgroundSource="HostBackdrop"
@@ -107,6 +113,12 @@
                 TintOpacity="1" />
 
             <!--  Tabs Area Background  -->
+            <AcrylicBrush
+                x:Key="RootBackgroundBrush"
+                BackgroundSource="HostBackdrop"
+                FallbackColor="{ThemeResource SolidBackgroundFillColorSecondary}"
+                TintColor="{ThemeResource SolidBackgroundFillColorSecondary}"
+                TintOpacity="0.95" />
             <AcrylicBrush
                 x:Key="HorizontalTabControlBackgroundBrush"
                 BackgroundSource="HostBackdrop"