feature: supports using native window frame on Linux (#390)

src/Resources/Locales/de_DE.axaml

@@ -382,13 +382,13 @@
   <x:String x:Key="Text.Preference.Appearance.OnlyUseMonoFontInEditor" xml:space="preserve">Verwende nur die Monospace-Schriftart im Texteditor</x:String>
   <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">Design</x:String>
   <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">Design-Anpassungen</x:String>
+  <x:String x:Key="Text.Preference.Appearance.UseFixedTabWidth" xml:space="preserve">Fixe Tab-Breite in Titelleiste</x:String>
   <x:String x:Key="Text.Preference.General" xml:space="preserve">ALLGEMEIN</x:String>
   <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">Beim Starten nach Updates suchen</x:String>
   <x:String x:Key="Text.Preference.General.Locale" xml:space="preserve">Sprache</x:String>
   <x:String x:Key="Text.Preference.General.MaxHistoryCommits" xml:space="preserve">Commit-Historie</x:String>
   <x:String x:Key="Text.Preference.General.RestoreTabs" xml:space="preserve">Zuletzt geöffnete Tabs beim Starten wiederherstellen</x:String>
   <x:String x:Key="Text.Preference.General.SubjectGuideLength" xml:space="preserve">Längenvorgabe für Commit-Nachrichten</x:String>
-  <x:String x:Key="Text.Preference.General.UseFixedTabWidth" xml:space="preserve">Fixe Tab-Breite in Titelleiste</x:String>
   <x:String x:Key="Text.Preference.General.VisibleDiffContextLines" xml:space="preserve">Sichtbare Vergleichskontextzeilen</x:String>
   <x:String x:Key="Text.Preference.Git" xml:space="preserve">GIT</x:String>
   <x:String x:Key="Text.Preference.Git.AutoFetch" xml:space="preserve">Remotes automatisch fetchen</x:String>

src/Resources/Locales/en_US.axaml

@@ -379,13 +379,14 @@
   <x:String x:Key="Text.Preference.Appearance.OnlyUseMonoFontInEditor" xml:space="preserve">Only use monospace font in text editor</x:String>
   <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">Theme</x:String>
   <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">Theme Overrides</x:String>
+  <x:String x:Key="Text.Preference.Appearance.UseFixedTabWidth" xml:space="preserve">Use fixed tab width in titlebar</x:String>
+  <x:String x:Key="Text.Preference.Appearance.UseNativeWindowFrame" xml:space="preserve">Use native window frame</x:String>
   <x:String x:Key="Text.Preference.General" xml:space="preserve">GENERAL</x:String>
   <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">Check for updates on startup</x:String>
   <x:String x:Key="Text.Preference.General.Locale" xml:space="preserve">Language</x:String>
   <x:String x:Key="Text.Preference.General.MaxHistoryCommits" xml:space="preserve">History Commits</x:String>
   <x:String x:Key="Text.Preference.General.RestoreTabs" xml:space="preserve">Restore last opened tab(s) on startup</x:String>
   <x:String x:Key="Text.Preference.General.SubjectGuideLength" xml:space="preserve">Subject Guide Length</x:String>
-  <x:String x:Key="Text.Preference.General.UseFixedTabWidth" xml:space="preserve">Use fixed tab width in titlebar</x:String>
   <x:String x:Key="Text.Preference.General.VisibleDiffContextLines" xml:space="preserve">Visible Diff Context Lines</x:String>
   <x:String x:Key="Text.Preference.Git" xml:space="preserve">GIT</x:String>
   <x:String x:Key="Text.Preference.Git.AutoFetch" xml:space="preserve">Fetch remotes automatically</x:String>

src/Resources/Locales/pt_BR.axaml

@@ -382,13 +382,13 @@
   <x:String x:Key="Text.Preference.Appearance.OnlyUseMonoFontInEditor" xml:space="preserve">Usar apenas fonte monoespaçada no editor de texto</x:String>
   <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">Tema</x:String>
   <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">Sobrescrever Tema</x:String>
+  <x:String x:Key="Text.Preference.Appearance.UseFixedTabWidth" xml:space="preserve">Usar largura fixa da aba na barra de título</x:String>
   <x:String x:Key="Text.Preference.General" xml:space="preserve">GERAL</x:String>
   <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">Verificar atualizações na inicialização</x:String>
   <x:String x:Key="Text.Preference.General.Locale" xml:space="preserve">Idioma</x:String>
   <x:String x:Key="Text.Preference.General.MaxHistoryCommits" xml:space="preserve">Commits do Histórico</x:String>
   <x:String x:Key="Text.Preference.General.RestoreTabs" xml:space="preserve">Restaurar as últimas abas abertas na inicialização</x:String>
   <x:String x:Key="Text.Preference.General.SubjectGuideLength" xml:space="preserve">Comprimento do Guia de Assunto</x:String>
-  <x:String x:Key="Text.Preference.General.UseFixedTabWidth" xml:space="preserve">Usar largura fixa da aba na barra de título</x:String>
   <x:String x:Key="Text.Preference.General.VisibleDiffContextLines" xml:space="preserve">Linhas de Contexto de Diferença Visíveis</x:String>
   <x:String x:Key="Text.Preference.Git" xml:space="preserve">GIT</x:String>
   <x:String x:Key="Text.Preference.Git.AutoFetch" xml:space="preserve">Buscar remotos automaticamente</x:String>

src/Resources/Locales/zh_CN.axaml

@@ -382,13 +382,14 @@
   <x:String x:Key="Text.Preference.Appearance.OnlyUseMonoFontInEditor" xml:space="preserve">仅在文本编辑器中使用等宽字体</x:String>
   <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">主题</x:String>
   <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">主题自定义</x:String>
+  <x:String x:Key="Text.Preference.Appearance.UseFixedTabWidth" xml:space="preserve">主标签使用固定宽度</x:String>
+  <x:String x:Key="Text.Preference.Appearance.UseNativeWindowFrame" xml:space="preserve">使用系统默认窗体样式</x:String>
   <x:String x:Key="Text.Preference.General" xml:space="preserve">通用配置</x:String>
   <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">启动时检测软件更新</x:String>
   <x:String x:Key="Text.Preference.General.Locale" xml:space="preserve">显示语言</x:String>
   <x:String x:Key="Text.Preference.General.MaxHistoryCommits" xml:space="preserve">最大历史提交数</x:String>
   <x:String x:Key="Text.Preference.General.RestoreTabs" xml:space="preserve">启动时恢复上次打开的仓库</x:String>
   <x:String x:Key="Text.Preference.General.SubjectGuideLength" xml:space="preserve">SUBJECT字数检测</x:String>
-  <x:String x:Key="Text.Preference.General.UseFixedTabWidth" xml:space="preserve">使用固定宽度的标题栏标签</x:String>
   <x:String x:Key="Text.Preference.General.VisibleDiffContextLines" xml:space="preserve">DIFF上下文行数</x:String>
   <x:String x:Key="Text.Preference.Git" xml:space="preserve">GIT配置</x:String>
   <x:String x:Key="Text.Preference.Git.AutoFetch" xml:space="preserve">启用定时自动拉取远程更新</x:String>

src/Resources/Locales/zh_TW.axaml

@@ -382,13 +382,14 @@
   <x:String x:Key="Text.Preference.Appearance.OnlyUseMonoFontInEditor" xml:space="preserve">僅在文字編輯器中使用等寬字體</x:String>
   <x:String x:Key="Text.Preference.Appearance.Theme" xml:space="preserve">主題</x:String>
   <x:String x:Key="Text.Preference.Appearance.ThemeOverrides" xml:space="preserve">主題自訂</x:String>
+  <x:String x:Key="Text.Preference.Appearance.UseFixedTabWidth" xml:space="preserve">使用固定寬度的標題欄標籤</x:String>
+  <x:String x:Key="Text.Preference.Appearance.UseNativeWindowFrame" xml:space="preserve">使用系統預設窗口樣式</x:String>
   <x:String x:Key="Text.Preference.General" xml:space="preserve">通用配置</x:String>
   <x:String x:Key="Text.Preference.General.Check4UpdatesOnStartup" xml:space="preserve">啟動時檢測軟體更新</x:String>
   <x:String x:Key="Text.Preference.General.Locale" xml:space="preserve">顯示語言</x:String>
   <x:String x:Key="Text.Preference.General.MaxHistoryCommits" xml:space="preserve">最大歷史提交數</x:String>
   <x:String x:Key="Text.Preference.General.RestoreTabs" xml:space="preserve">啟動時恢復上次開啟的倉庫</x:String>
   <x:String x:Key="Text.Preference.General.SubjectGuideLength" xml:space="preserve">SUBJECT字數檢測</x:String>
-  <x:String x:Key="Text.Preference.General.UseFixedTabWidth" xml:space="preserve">使用固定寬度的標題欄標籤</x:String>
   <x:String x:Key="Text.Preference.General.VisibleDiffContextLines" xml:space="preserve">DIFF上下文行數</x:String>
   <x:String x:Key="Text.Preference.Git" xml:space="preserve">GIT配置</x:String>
   <x:String x:Key="Text.Preference.Git.AutoFetch" xml:space="preserve">啟用定時自動拉取遠端更新</x:String>

src/ViewModels/Preference.cs

@@ -105,6 +105,12 @@ namespace SourceGit.ViewModels
             }
         }
 
+        public bool UseSystemWindowFrame
+        {
+            get => _useSystemWindowFrame;
+            set => SetProperty(ref _useSystemWindowFrame, value);
+        }
+
         public double DefaultFontSize
         {
             get => _defaultFontSize;
@@ -492,6 +498,7 @@ namespace SourceGit.ViewModels
         private string _defaultFontFamily = string.Empty;
         private string _monospaceFontFamily = string.Empty;
         private bool _onlyUseMonoFontInEditor = false;
+        private bool _useSystemWindowFrame = false;
         private double _defaultFontSize = 13;
         private LayoutInfo _layout = new LayoutInfo();
 

src/Views/About.axaml

@@ -13,7 +13,7 @@
                     WindowStartupLocation="CenterScreen">
   <Grid RowDefinitions="Auto,*">
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30" IsVisible="{Binding !UseSystemWindowFrame}">
       <Border Grid.Column="0" Grid.ColumnSpan="3"
               Background="{DynamicResource Brush.TitleBar}"
               BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border0}"

src/Views/Askpass.axaml

@@ -13,7 +13,7 @@
                     WindowStartupLocation="CenterScreen">
   <Grid RowDefinitions="Auto,*">
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30" IsVisible="{Binding !UseSystemWindowFrame}">
       <Border Grid.Column="0" Grid.ColumnSpan="3"
               Background="{DynamicResource Brush.TitleBar}"
               BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border0}"

src/Views/AssumeUnchangedManager.axaml

@@ -8,6 +8,7 @@
                     mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
                     x:Class="SourceGit.Views.AssumeUnchangedManager"
                     x:DataType="vm:AssumeUnchangedManager"
+                    x:Name="ThisControl"
                     Icon="/App.ico"
                     Title="{DynamicResource Text.AssumeUnchanged}"
                     Width="600" Height="400"
@@ -15,7 +16,7 @@
                     WindowStartupLocation="CenterOwner">
   <Grid RowDefinitions="Auto,*">    
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
       <Border Grid.Column="0" Grid.ColumnSpan="3"
               Background="{DynamicResource Brush.TitleBar}"
               BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border0}"

src/Views/Blame.axaml

@@ -7,18 +7,19 @@
                     mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
                     x:Class="SourceGit.Views.Blame"
                     x:DataType="vm:Blame"
+                    x:Name="ThisControl"
                     Icon="/App.ico"
                     Title="{DynamicResource Text.Blame}"
                     MinWidth="1280" MinHeight="720">
   <Grid>
     <Grid.RowDefinitions>
-      <RowDefinition Height="30"/>
+      <RowDefinition Height="Auto"/>
       <RowDefinition Height="24"/>
       <RowDefinition Height="*"/>
     </Grid.RowDefinitions>
 
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,Auto,*,Auto">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
       <!-- Bottom border -->
       <Border Grid.Column="0" Grid.ColumnSpan="4"
               Background="{DynamicResource Brush.TitleBar}"

src/Views/BranchCompare.axaml

@@ -8,19 +8,20 @@
                     mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
                     x:Class="SourceGit.Views.BranchCompare"
                     x:DataType="vm:BranchCompare"
+                    x:Name="ThisControl"
                     Icon="/App.ico"
                     Title="{DynamicResource Text.BranchCompare}"
                     MinWidth="1280" MinHeight="720"
                     WindowStartupLocation="CenterOwner">
   <Grid>
     <Grid.RowDefinitions>
-      <RowDefinition Height="30"/>
+      <RowDefinition Height="Auto"/>
       <RowDefinition Height="64"/>
       <RowDefinition Height="*"/>
     </Grid.RowDefinitions>
 
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,Auto,*,Auto">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
       <!-- Bottom border -->
       <Border Grid.Column="0" Grid.ColumnSpan="4"
               Background="{DynamicResource Brush.TitleBar}"

src/Views/ChromelessWindow.cs

@@ -8,15 +8,25 @@ namespace SourceGit.Views
 {
     public class ChromelessWindow : Window
     {
+        public bool UseSystemWindowFrame
+        {
+            get => OperatingSystem.IsLinux() && ViewModels.Preference.Instance.UseSystemWindowFrame;
+        }
+
         protected override Type StyleKeyOverride => typeof(Window);
 
         public ChromelessWindow()
         {
             if (OperatingSystem.IsLinux())
+            {
+                if (!UseSystemWindowFrame)
                     Classes.Add("custom_window_frame");
+            }
             else if (OperatingSystem.IsWindows())
+            {
                 Classes.Add("fix_maximized_padding");
             }
+        }
 
         protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
         {

src/Views/ConfirmRestart.axaml

@@ -0,0 +1,65 @@
+<v:ChromelessWindow xmlns="https://github.com/avaloniaui"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+                    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+                    xmlns:v="using:SourceGit.Views"
+                    mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+                    x:Class="SourceGit.Views.ConfirmRestart"
+                    x:Name="ThisControl"
+                    Title="Restart Required"
+                    Icon="/App.ico"
+                    CanResize="False"
+                    SizeToContent="WidthAndHeight"
+                    WindowStartupLocation="CenterOwner">
+  <Grid RowDefinitions="Auto,*">
+    <!-- TitleBar -->
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
+      <Border Grid.Column="0" Grid.ColumnSpan="3"
+              Background="{DynamicResource Brush.TitleBar}"
+              BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border0}"
+              PointerPressed="BeginMoveWindow"/>
+
+      <Path Grid.Column="0"
+            Width="14" Height="14"
+            Margin="10,0,0,0"
+            Data="{StaticResource Icons.Info}"
+            IsVisible="{OnPlatform True, macOS=False}"/>
+
+      <Grid Grid.Column="0" Classes="caption_button_box" Margin="2,4,0,0" IsVisible="{OnPlatform False, macOS=True}">
+        <Button Classes="caption_button_macos" Click="CloseWindow">
+          <Grid>
+            <Ellipse Fill="{DynamicResource Brush.MacOS.Close}"/>
+            <Path Height="6" Width="6" Stretch="Fill" Fill="#505050" Data="{StaticResource Icons.MacOS.Close}"/>
+          </Grid>
+        </Button>
+      </Grid>
+
+      <TextBlock Grid.Column="0" Grid.ColumnSpan="3"
+                 Classes="bold"
+                 Text="Restart Required"
+                 HorizontalAlignment="Center" VerticalAlignment="Center"
+                 IsHitTestVisible="False"/>
+
+      <Button Grid.Column="2"
+              Classes="caption_button"
+              Click="CloseWindow"
+              IsVisible="{OnPlatform True, macOS=False}">
+        <Path Data="{StaticResource Icons.Window.Close}"/>
+      </Button>
+    </Grid>
+
+    <StackPanel Grid.Row="1" Margin="0,16" Orientation="Vertical">
+      <Border Margin="16,0">
+        <TextBlock Text="You need to restart this app to apply changes."/>
+      </Border>
+
+      <Button Classes="flat primary"
+              Width="80"
+              Margin="0,16,0,0"
+              Content="{DynamicResource Text.Sure}"
+              Click="Restart"
+              HorizontalAlignment="Center"
+              HotKey="Enter"/>
+    </StackPanel>
+  </Grid>
+</v:ChromelessWindow>

src/Views/ConfirmRestart.axaml.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Diagnostics;
+
+using Avalonia.Controls;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+
+namespace SourceGit.Views
+{
+    public partial class ConfirmRestart : ChromelessWindow
+    {
+        public ConfirmRestart()
+        {
+            InitializeComponent();
+        }
+
+        private void BeginMoveWindow(object _, PointerPressedEventArgs e)
+        {
+            BeginMoveDrag(e);
+        }
+
+        private void CloseWindow(object _1, RoutedEventArgs _2)
+        {
+            Console.Out.WriteLine("No passphrase entered.");
+            App.Quit(-1);
+        }
+
+        private void Restart(object _1, RoutedEventArgs _2)
+        {
+            var selfExecFile = Process.GetCurrentProcess().MainModule!.FileName;
+            Process.Start(selfExecFile);
+            App.Quit(-1);
+        }
+    }
+}

src/Views/FileHistories.axaml

@@ -9,18 +9,18 @@
                     mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
                     x:Class="SourceGit.Views.FileHistories"
                     x:DataType="vm:FileHistories"
-                    x:Name="me"
+                    x:Name="ThisControl"
                     Icon="/App.ico"
                     Title="{DynamicResource Text.FileHistory}"
                     MinWidth="1280" MinHeight="720">
   <Grid>
     <Grid.RowDefinitions>
-      <RowDefinition Height="30"/>
+      <RowDefinition Height="Auto"/>
       <RowDefinition Height="*"/>
     </Grid.RowDefinitions>
 
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,Auto,*,Auto">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
       <!-- Bottom border -->
       <Border Grid.Column="0" Grid.ColumnSpan="5"
               Background="{DynamicResource Brush.TitleBar}"

src/Views/Hotkeys.axaml

@@ -7,6 +7,7 @@
                     xmlns:v="using:SourceGit.Views"
                     mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
                     x:Class="SourceGit.Views.Hotkeys"
+                    x:Name="ThisControl"
                     Icon="/App.ico"
                     Title="{DynamicResource Text.Hotkeys}"
                     SizeToContent="WidthAndHeight"
@@ -14,7 +15,7 @@
                     WindowStartupLocation="CenterOwner">
   <Grid RowDefinitions="Auto,*">
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
       <Border Grid.Column="0" Grid.ColumnSpan="3"
               Background="{DynamicResource Brush.TitleBar}"
               BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border0}"

src/Views/InteractiveRebase.axaml

@@ -9,13 +9,14 @@
                     mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
                     x:Class="SourceGit.Views.InteractiveRebase"
                     x:DataType="vm:InteractiveRebase"
+                    x:Name="ThisControl"
                     Icon="/App.ico"
                     Title="{DynamicResource Text.InteractiveRebase}"
                     Width="1080" Height="720"
                     WindowStartupLocation="CenterOwner">
   <Grid RowDefinitions="Auto,Auto,*,Auto">
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
       <Border Grid.Column="0" Grid.ColumnSpan="3"
               Background="{DynamicResource Brush.TitleBar}"
               BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border0}"

src/Views/LFSLocks.axaml

@@ -7,13 +7,14 @@
                     mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
                     x:Class="SourceGit.Views.LFSLocks"
                     x:DataType="vm:LFSLocks"
+                    x:Name="ThisControl"
                     Icon="/App.ico"
                     Title="{DynamicResource Text.GitLFS.Locks.Title}"
                     Width="600" Height="400"
                     WindowStartupLocation="CenterOwner">
   <Grid RowDefinitions="Auto,*">
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
       <Border Grid.Column="0" Grid.ColumnSpan="3"
               Background="{DynamicResource Brush.TitleBar}"
               BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border0}"

src/Views/Launcher.axaml

@@ -8,13 +8,14 @@
                     mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
                     x:Class="SourceGit.Views.Launcher"
                     x:DataType="vm:Launcher"
+                    x:Name="ThisControl"
                     Icon="/App.ico"
                     Title="SourceGit"
                     MinWidth="1024" MinHeight="600"
                     WindowStartupLocation="CenterScreen"> 
-  <Grid x:Name="MainLayout">
+  <Grid>
     <Grid.RowDefinitions>
-      <RowDefinition Height="38"/>
+      <RowDefinition Height="{Binding #ThisControl.CaptionHeight}"/>
       <RowDefinition Height="*"/>
     </Grid.RowDefinitions>
 
@@ -72,7 +73,7 @@
       <v:LauncherTabBar Grid.Column="1" Height="30" VerticalAlignment="Bottom"/>
 
       <!-- Caption Buttons (Windows/Linux)-->
-      <Border Grid.Column="2" Margin="32,0,0,0" IsVisible="{OnPlatform True, macOS=False}">
+      <Border Grid.Column="2" Margin="32,0,0,0" IsVisible="{Binding #ThisControl.IsRightCaptionButtonsVisible}">
         <v:CaptionButtons Height="30" VerticalAlignment="Top"/>
       </Border>
     </Grid>

src/Views/Launcher.axaml.cs

@@ -8,6 +8,25 @@ namespace SourceGit.Views
 {
     public partial class Launcher : ChromelessWindow
     {
+        public static readonly StyledProperty<GridLength> CaptionHeightProperty =
+            AvaloniaProperty.Register<Launcher, GridLength>(nameof(CaptionHeight));
+
+        public GridLength CaptionHeight
+        {
+            get => GetValue(CaptionHeightProperty);
+            set => SetValue(CaptionHeightProperty, value);
+        }
+
+        public bool IsRightCaptionButtonsVisible
+        {
+            get
+            {
+                if (OperatingSystem.IsLinux())
+                    return !ViewModels.Preference.Instance.UseSystemWindowFrame;
+                return OperatingSystem.IsWindows();
+            }
+        }
+
         public Launcher()
         {
             var layout = ViewModels.Preference.Instance.Layout;
@@ -17,6 +36,11 @@ namespace SourceGit.Views
                 Height = layout.LauncherHeight;
             }
 
+            if (UseSystemWindowFrame)
+                CaptionHeight = new GridLength(30);
+            else
+                CaptionHeight = new GridLength(38);
+
             InitializeComponent();
         }
 
@@ -38,13 +62,15 @@ namespace SourceGit.Views
         {
             base.OnPropertyChanged(change);
 
-            if (change.Property == WindowStateProperty && MainLayout != null)
+            if (change.Property == WindowStateProperty)
             {
                 var state = (WindowState)change.NewValue!;
-                if (state == WindowState.Maximized)
+                if (OperatingSystem.IsLinux() && UseSystemWindowFrame)
-                    MainLayout.RowDefinitions[0].Height = new GridLength(OperatingSystem.IsMacOS() ? 34 : 30);
+                    CaptionHeight = new GridLength(30);
+                else if (state == WindowState.Maximized)
+                    CaptionHeight = new GridLength(OperatingSystem.IsMacOS() ? 34 : 30);
                 else
-                    MainLayout.RowDefinitions[0].Height = new GridLength(38);
+                    CaptionHeight = new GridLength(38);
 
                 ViewModels.Preference.Instance.Layout.LauncherWindowState = state;
             }

src/Views/Preference.axaml

@@ -18,7 +18,7 @@
                     WindowStartupLocation="CenterScreen">
   <Grid RowDefinitions="Auto,Auto" MinWidth="600">
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
       <Border Grid.Column="0" Grid.ColumnSpan="3"
               Background="{DynamicResource Brush.TitleBar}"
               BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border0}"
@@ -57,7 +57,7 @@
           <TabItem.Header>
             <TextBlock Classes="tab_header" Text="{DynamicResource Text.Preference.General}"/>
           </TabItem.Header>
-          <Grid Margin="8" RowDefinitions="32,32,32,32,32,32,32" ColumnDefinitions="Auto,*">
+          <Grid Margin="8" RowDefinitions="32,32,32,32,32,32" ColumnDefinitions="Auto,*">
             <TextBlock Grid.Row="0" Grid.Column="0"
                        Text="{DynamicResource Text.Preference.General.Locale}"
                        HorizontalAlignment="Right"
@@ -120,11 +120,6 @@
                       IsChecked="{Binding RestoreTabs, Mode=TwoWay}"/>
 
             <CheckBox Grid.Row="5" Grid.Column="1"
-                      Height="32"
-                      Content="{DynamicResource Text.Preference.General.UseFixedTabWidth}"
-                      IsChecked="{Binding Source={x:Static vm:Preference.Instance}, Path=UseFixedTabWidth, Mode=TwoWay}"/>
-
-            <CheckBox Grid.Row="6" Grid.Column="1"
                       Height="32"
                       Content="{DynamicResource Text.Preference.General.Check4UpdatesOnStartup}"
                       IsChecked="{Binding Source={x:Static vm:Preference.Instance}, Path=Check4UpdatesOnStartup, Mode=TwoWay}"/>
@@ -135,7 +130,7 @@
           <TabItem.Header>
             <TextBlock Classes="tab_header" Text="{DynamicResource Text.Preference.Appearance}"/>
           </TabItem.Header>
-          <Grid Margin="8" RowDefinitions="32,32,32,32,32,32" ColumnDefinitions="Auto,*">
+          <Grid Margin="8" RowDefinitions="32,32,32,32,32,32,32,Auto" ColumnDefinitions="Auto,*">
             <TextBlock Grid.Row="0" Grid.Column="0"
                        Text="{DynamicResource Text.Preference.Appearance.Theme}"
                        HorizontalAlignment="Right"
@@ -201,6 +196,18 @@
             <CheckBox Grid.Row="5" Grid.Column="1"
                       Content="{DynamicResource Text.Preference.Appearance.OnlyUseMonoFontInEditor}"
                       IsChecked="{Binding OnlyUseMonoFontInEditor, Mode=TwoWay}"/>
+
+            <CheckBox Grid.Row="6" Grid.Column="1"
+                      Height="32"
+                      Content="{DynamicResource Text.Preference.Appearance.UseFixedTabWidth}"
+                      IsChecked="{Binding Source={x:Static vm:Preference.Instance}, Path=UseFixedTabWidth, Mode=TwoWay}"/>
+
+            <CheckBox Grid.Row="7" Grid.Column="1"
+                      Height="32"
+                      Content="{DynamicResource Text.Preference.Appearance.UseNativeWindowFrame}"
+                      IsChecked="{Binding Source={x:Static vm:Preference.Instance}, Path=UseSystemWindowFrame, Mode=OneTime}"
+                      IsVisible="{OnPlatform False, Linux=True}"
+                      IsCheckedChanged="OnUseNativeWindowFrameChanged"/>
           </Grid>
         </TabItem>
 

src/Views/Preference.axaml.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 
 using Avalonia;
+using Avalonia.Controls;
 using Avalonia.Input;
 using Avalonia.Interactivity;
 using Avalonia.Platform.Storage;
@@ -247,5 +248,19 @@ namespace SourceGit.Views
             if (changed)
                 new Commands.Config(null).Set(key, value);
         }
+
+        private void OnUseNativeWindowFrameChanged(object sender, RoutedEventArgs e)
+        {
+            if (sender is CheckBox box)
+            {
+                ViewModels.Preference.Instance.UseSystemWindowFrame = box.IsChecked == true;
+                ViewModels.Preference.Instance.Save();
+
+                var dialog = new ConfirmRestart();
+                App.OpenDialog(dialog);
+            }
+            
+            e.Handled = true;
+        }
     }
 }

src/Views/RepositoryConfigure.axaml

@@ -8,14 +8,15 @@
                     mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
                     x:Class="SourceGit.Views.RepositoryConfigure"
                     x:DataType="vm:RepositoryConfigure"
+                    x:Name="ThisControl"
                     Icon="/App.ico"
                     Title="{DynamicResource Text.Configure}"
                     Width="600" SizeToContent="Height"
                     CanResize="False"
                     WindowStartupLocation="CenterOwner">
-  <Grid RowDefinitions="Auto,Auto,Auto">
+  <Grid RowDefinitions="Auto,Auto">
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
       <Border Grid.Column="0" Grid.ColumnSpan="3"
               Background="{DynamicResource Brush.TitleBar}"
               BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border0}"

src/Views/SelfUpdate.axaml

@@ -9,6 +9,7 @@
                     mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
                     x:Class="SourceGit.Views.SelfUpdate"
                     x:DataType="vm:SelfUpdate"
+                    x:Name="ThisControl"
                     Title="{DynamicResource Text.SelfUpdate.Title}"
                     Icon="/App.ico"
                     SizeToContent="WidthAndHeight"
@@ -16,7 +17,7 @@
                     WindowStartupLocation="CenterOwner">
   <Grid RowDefinitions="Auto,*">
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
       <Border Grid.Column="0" Grid.ColumnSpan="3"
               Background="{DynamicResource Brush.TitleBar}"
               BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border0}"

src/Views/StandaloneCommitMessageEditor.axaml

@@ -5,6 +5,7 @@
                     xmlns:v="using:SourceGit.Views"
                     mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
                     x:Class="SourceGit.Views.StandaloneCommitMessageEditor"
+                    x:Name="ThisControl"
                     Icon="/App.ico"
                     Title="{DynamicResource Text.CodeEditor}"
                     Width="800"
@@ -13,7 +14,7 @@
                     WindowStartupLocation="CenterScreen">
   <Grid RowDefinitions="Auto,*">
     <!-- TitleBar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
       <Border Grid.Column="0" Grid.ColumnSpan="3"
               Background="{DynamicResource Brush.TitleBar}"
               BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border0}"

src/Views/Statistics.axaml

@@ -8,13 +8,14 @@
                     mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
                     x:Class="SourceGit.Views.Statistics"
                     x:DataType="vm:Statistics"
+                    x:Name="ThisControl"
                     Title="{DynamicResource Text.Statistics}"
                     Width="800" Height="450"
                     WindowStartupLocation="CenterOwner"
                     CanResize="False">
   <Grid RowDefinitions="Auto,Auto,*">
     <!-- Title bar -->
-    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30">
+    <Grid Grid.Row="0" ColumnDefinitions="Auto,*,Auto" Height="30" IsVisible="{Binding !#ThisControl.UseSystemWindowFrame}">
       <Border Grid.Column="0" Grid.ColumnSpan="3"
               Background="{DynamicResource Brush.TitleBar}"
               BorderThickness="0,0,0,1" BorderBrush="{DynamicResource Brush.Border0}"