Add MicaBaseAlt Fallback Brushes (#6825)

* add micabasealt fallback brushes

* update brush names

* changes from comments

Author: karkarl

dev/CommonStyles/Common_themeresources_any.xaml

@@ -85,7 +85,7 @@
             <Color x:Key="LayerFillColorAlt">#0DFFFFFF</Color>
             <Color x:Key="LayerOnAcrylicFillColorDefault">#09FFFFFF</Color>
             <Color x:Key="LayerOnAccentAcrylicFillColorDefault">#09FFFFFF</Color>
-
+  
             <Color x:Key="LayerOnMicaBaseAltFillColorDefault">#733A3A3A</Color>
             <Color x:Key="LayerOnMicaBaseAltFillColorSecondary">#0FFFFFFF</Color>
             <Color x:Key="LayerOnMicaBaseAltFillColorTertiary">#2C2C2C</Color>
@@ -96,6 +96,7 @@
             <Color x:Key="SolidBackgroundFillColorTertiary">#282828</Color>
             <Color x:Key="SolidBackgroundFillColorQuarternary">#2C2C2C</Color>
             <Color x:Key="SolidBackgroundFillColorTransparent">#00202020</Color>
+            <Color x:Key="SolidBackgroundFillColorBaseAlt">#0A0A0A</Color>
 
             <Color x:Key="SystemFillColorSuccess">#6CCB5F</Color>
             <Color x:Key="SystemFillColorCaution">#FCE100</Color>
@@ -197,7 +198,7 @@
             <SolidColorBrush x:Key="LayerFillColorAltBrush" Color="{StaticResource LayerFillColorAlt}" />
             <SolidColorBrush x:Key="LayerOnAcrylicFillColorDefaultBrush" Color="{StaticResource LayerOnAcrylicFillColorDefault}" />
             <SolidColorBrush x:Key="LayerOnAccentAcrylicFillColorDefaultBrush" Color="{StaticResource LayerOnAccentAcrylicFillColorDefault}" />
-
+         
             <SolidColorBrush x:Key="LayerOnMicaBaseAltFillColorDefaultBrush" Color="{StaticResource LayerOnMicaBaseAltFillColorDefault}" />
             <SolidColorBrush x:Key="LayerOnMicaBaseAltFillColorSecondaryBrush" Color="{StaticResource LayerOnMicaBaseAltFillColorSecondary}" />
             <SolidColorBrush x:Key="LayerOnMicaBaseAltFillColorTertiaryBrush" Color="{StaticResource LayerOnMicaBaseAltFillColorTertiary}" />
@@ -207,7 +208,8 @@
             <SolidColorBrush x:Key="SolidBackgroundFillColorSecondaryBrush" Color="{StaticResource SolidBackgroundFillColorSecondary}" />
             <SolidColorBrush x:Key="SolidBackgroundFillColorTertiaryBrush" Color="{StaticResource SolidBackgroundFillColorTertiary}" />
             <SolidColorBrush x:Key="SolidBackgroundFillColorQuarternaryBrush" Color="{StaticResource SolidBackgroundFillColorQuarternary}" />
-
+            <SolidColorBrush x:Key="SolidBackgroundFillColorBaseAltBrush" Color="{StaticResource SolidBackgroundFillColorBaseAlt}" />
+            
             <SolidColorBrush x:Key="SystemFillColorAttentionBrush" Color="{ThemeResource SystemAccentColorLight2}" />
             <SolidColorBrush x:Key="SystemFillColorSuccessBrush" Color="{StaticResource SystemFillColorSuccess}" />
             <SolidColorBrush x:Key="SystemFillColorCautionBrush" Color="{StaticResource SystemFillColorCaution}" />
@@ -340,7 +342,7 @@
             <Color x:Key="LayerFillColorAlt">#FFFFFF</Color>
             <Color x:Key="LayerOnAcrylicFillColorDefault">#40FFFFFF</Color>
             <Color x:Key="LayerOnAccentAcrylicFillColorDefault">#40FFFFFF</Color>
-
+       
             <Color x:Key="LayerOnMicaBaseAltFillColorDefault">#B3FFFFFF</Color>
             <Color x:Key="LayerOnMicaBaseAltFillColorSecondary">#0A000000</Color>
             <Color x:Key="LayerOnMicaBaseAltFillColorTertiary">#F9F9F9</Color>
@@ -351,6 +353,7 @@
             <Color x:Key="SolidBackgroundFillColorTertiary">#F9F9F9</Color>
             <Color x:Key="SolidBackgroundFillColorQuarternary">#FFFFFF</Color>
             <Color x:Key="SolidBackgroundFillColorTransparent">#00F3F3F3</Color>
+            <Color x:Key="SolidBackgroundFillColorBaseAlt">#DADADA</Color>
 
             <Color x:Key="SystemFillColorSuccess">#0F7B0F</Color>
             <Color x:Key="SystemFillColorCaution">#9D5D00</Color>
@@ -462,6 +465,7 @@
             <SolidColorBrush x:Key="SolidBackgroundFillColorSecondaryBrush" Color="{StaticResource SolidBackgroundFillColorSecondary}" />
             <SolidColorBrush x:Key="SolidBackgroundFillColorTertiaryBrush" Color="{StaticResource SolidBackgroundFillColorTertiary}" />
             <SolidColorBrush x:Key="SolidBackgroundFillColorQuarternaryBrush" Color="{StaticResource SolidBackgroundFillColorQuarternary}" />
+            <SolidColorBrush x:Key="SolidBackgroundFillColorBaseAltBrush" Color="{StaticResource SolidBackgroundFillColorBaseAlt}" />
 
             <SolidColorBrush x:Key="SystemFillColorAttentionBrush" Color="{ThemeResource SystemAccentColor}" />
             <SolidColorBrush x:Key="SystemFillColorSuccessBrush" Color="{StaticResource SystemFillColorSuccess}" />
@@ -613,6 +617,7 @@
             <SolidColorBrush x:Key="SolidBackgroundFillColorSecondaryBrush" Color="{ThemeResource SystemColorWindowColor}" />
             <SolidColorBrush x:Key="SolidBackgroundFillColorTertiaryBrush" Color="{ThemeResource SystemColorWindowColor}" />
             <SolidColorBrush x:Key="SolidBackgroundFillColorQuarternaryBrush" Color="{ThemeResource SystemColorWindowColor}" />
+            <SolidColorBrush x:Key="SolidBackgroundFillColorBaseAltBrush" Color="{ThemeResource SystemColorWindowColor}" />
 
             <SolidColorBrush x:Key="SystemFillColorAttentionBrush" Color="{ThemeResource SystemColorWindowTextColor}" />
             <SolidColorBrush x:Key="SystemFillColorSuccessBrush" Color="{ThemeResource SystemColorWindowTextColor}" />
@@ -700,6 +705,7 @@
             <Color x:Key="SolidBackgroundFillColorTertiary">#FF0000</Color>
             <Color x:Key="SolidBackgroundFillColorQuarternary">#FF0000</Color>
             <Color x:Key="SolidBackgroundFillColorTransparent">#FF0000</Color>
+            <Color x:Key="SolidBackgroundFillColorBaseAlt">#FF0000</Color>
             <Color x:Key="SystemFillColorSuccess">#FF0000</Color>
             <Color x:Key="SystemFillColorCaution">#FF0000</Color>
             <Color x:Key="SystemFillColorCritical">#FF0000</Color>