Fixed TabItem MinWidth issue (#10865)

* Fixed TabItem MinWidth issue

* Reupdated the Fluent system file

---------

Co-authored-by: Dipesh Kumar <[email protected]>

Author: dipeshmsft

src/Microsoft.DotNet.Wpf/src/Themes/PresentationFramework.Fluent/Styles/TabControl.xaml

@@ -225,9 +225,7 @@
                     <Grid x:Name="Root">
                         <Border
                             x:Name="Border"
-                            MinWidth="180"
-                            MinHeight="36"
-                            Margin="0"
+                            MinHeight="32"
                             Padding="6"
                             Background="{TemplateBinding Background}"
                             BorderBrush="{TemplateBinding BorderBrush}"

src/Microsoft.DotNet.Wpf/src/Themes/PresentationFramework.Fluent/Themes/Fluent.Dark.xaml

@@ -4712,7 +4712,7 @@
       <Setter.Value>
         <ControlTemplate TargetType="{x:Type TabItem}">
           <Grid x:Name="Root">
-            <Border x:Name="Border" MinWidth="180" MinHeight="36" Margin="0" Padding="6" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1,1,1,0" CornerRadius="8,8,0,0">
+            <Border x:Name="Border" MinHeight="32" Padding="6" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1,1,1,0" CornerRadius="8,8,0,0">
               <ContentPresenter x:Name="ContentSite" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" ContentSource="Header" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" />
             </Border>
             <VisualStateManager.VisualStateGroups>

src/Microsoft.DotNet.Wpf/src/Themes/PresentationFramework.Fluent/Themes/Fluent.HC.xaml

@@ -4625,7 +4625,7 @@
       <Setter.Value>
         <ControlTemplate TargetType="{x:Type TabItem}">
           <Grid x:Name="Root">
-            <Border x:Name="Border" MinWidth="180" MinHeight="36" Margin="0" Padding="6" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1,1,1,0" CornerRadius="8,8,0,0">
+            <Border x:Name="Border" MinHeight="32" Padding="6" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1,1,1,0" CornerRadius="8,8,0,0">
               <ContentPresenter x:Name="ContentSite" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" ContentSource="Header" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" />
             </Border>
             <VisualStateManager.VisualStateGroups>

src/Microsoft.DotNet.Wpf/src/Themes/PresentationFramework.Fluent/Themes/Fluent.Light.xaml

@@ -4721,7 +4721,7 @@
       <Setter.Value>
         <ControlTemplate TargetType="{x:Type TabItem}">
           <Grid x:Name="Root">
-            <Border x:Name="Border" MinWidth="180" MinHeight="36" Margin="0" Padding="6" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1,1,1,0" CornerRadius="8,8,0,0">
+            <Border x:Name="Border" MinHeight="32" Padding="6" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1,1,1,0" CornerRadius="8,8,0,0">
               <ContentPresenter x:Name="ContentSite" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" ContentSource="Header" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" />
             </Border>
             <VisualStateManager.VisualStateGroups>

src/Microsoft.DotNet.Wpf/src/Themes/PresentationFramework.Fluent/Themes/Fluent.xaml

@@ -3974,7 +3974,7 @@
       <Setter.Value>
         <ControlTemplate TargetType="{x:Type TabItem}">
           <Grid x:Name="Root">
-            <Border x:Name="Border" MinWidth="180" MinHeight="36" Margin="0" Padding="6" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1,1,1,0" CornerRadius="8,8,0,0">
+            <Border x:Name="Border" MinHeight="32" Padding="6" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1,1,1,0" CornerRadius="8,8,0,0">
               <ContentPresenter x:Name="ContentSite" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" ContentSource="Header" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" />
             </Border>
             <VisualStateManager.VisualStateGroups>