feature: supports to use Ctrl+D/⌘+D to open in external diff/merge tool (#1312)

src/Resources/Locales/en_US.axaml

@@ -406,6 +406,7 @@
   <x:String x:Key="Text.Hotkeys.TextEditor.CloseSearch" xml:space="preserve">Close search panel</x:String>
   <x:String x:Key="Text.Hotkeys.TextEditor.GotoNextMatch" xml:space="preserve">Find next match</x:String>
   <x:String x:Key="Text.Hotkeys.TextEditor.GotoPrevMatch" xml:space="preserve">Find previous match</x:String>
+  <x:String x:Key="Text.Hotkeys.TextEditor.OpenExternalMergeTool" xml:space="preserve">Open with external diff/merge tool</x:String>
   <x:String x:Key="Text.Hotkeys.TextEditor.Search" xml:space="preserve">Open search panel</x:String>
   <x:String x:Key="Text.Hunk.Discard" xml:space="preserve">Discard</x:String>
   <x:String x:Key="Text.Hunk.Stage" xml:space="preserve">Stage</x:String>

src/Resources/Locales/zh_CN.axaml

@@ -410,6 +410,7 @@
   <x:String x:Key="Text.Hotkeys.TextEditor.CloseSearch" xml:space="preserve">关闭搜索</x:String>
   <x:String x:Key="Text.Hotkeys.TextEditor.GotoNextMatch" xml:space="preserve">定位到下一个匹配搜索的位置</x:String>
   <x:String x:Key="Text.Hotkeys.TextEditor.GotoPrevMatch" xml:space="preserve">定位到上一个匹配搜索的位置</x:String>
+  <x:String x:Key="Text.Hotkeys.TextEditor.OpenExternalMergeTool" xml:space="preserve">使用外部比对工具查看</x:String>
   <x:String x:Key="Text.Hotkeys.TextEditor.Search" xml:space="preserve">打开搜索</x:String>
   <x:String x:Key="Text.Hunk.Discard" xml:space="preserve">丢弃</x:String>
   <x:String x:Key="Text.Hunk.Stage" xml:space="preserve">暂存</x:String>

src/Resources/Locales/zh_TW.axaml

@@ -410,6 +410,7 @@
   <x:String x:Key="Text.Hotkeys.TextEditor.CloseSearch" xml:space="preserve">關閉搜尋面板</x:String>
   <x:String x:Key="Text.Hotkeys.TextEditor.GotoNextMatch" xml:space="preserve">前往下一個搜尋相符的位置</x:String>
   <x:String x:Key="Text.Hotkeys.TextEditor.GotoPrevMatch" xml:space="preserve">前往上一個搜尋相符的位置</x:String>
+  <x:String x:Key="Text.Hotkeys.TextEditor.OpenExternalMergeTool" xml:space="preserve">使用外部比對工具檢視</x:String>
   <x:String x:Key="Text.Hotkeys.TextEditor.Search" xml:space="preserve">開啟搜尋面板</x:String>
   <x:String x:Key="Text.Hunk.Discard" xml:space="preserve">捨棄</x:String>
   <x:String x:Key="Text.Hunk.Stage" xml:space="preserve">暫存</x:String>

src/Views/DiffView.axaml

@@ -175,7 +175,17 @@
               <Path Width="12" Height="12" Data="{StaticResource Icons.Layout}" Margin="0,2,0,0"/>
             </ToggleButton>
 
-            <Button Classes="icon_button" Width="28" Command="{Binding OpenExternalMergeTool}" ToolTip.Tip="{DynamicResource Text.Diff.UseMerger}">
+            <Button Classes="icon_button"
+                    Width="28"
+                    Command="{Binding OpenExternalMergeTool}"
+                    HotKey="{OnPlatform Ctrl+D, macOS=⌘+D}">
+              <ToolTip.Tip>
+                <TextBlock>
+                  <Run Text="{DynamicResource Text.Diff.UseMerger}"/>
+                  <Run Text=" "/>
+                  <Run Text="{OnPlatform Ctrl+D, macOS=⌘+D}" Foreground="{DynamicResource Brush.FG2}"/>
+                </TextBlock>
+              </ToolTip.Tip>
               <Path Width="12" Height="12" Stretch="Uniform" Data="{StaticResource Icons.OpenWith}"/>
             </Button>
           </StackPanel>

src/Views/Hotkeys.axaml

@@ -130,7 +130,7 @@
                    FontSize="{Binding Source={x:Static vm:Preferences.Instance}, Path=DefaultFontSize, Converter={x:Static c:DoubleConverters.Increase}}"
                    Margin="0,8"/>
 
-        <Grid RowDefinitions="20,20,20,20" ColumnDefinitions="150,*">
+        <Grid RowDefinitions="20,20,20,20,20" ColumnDefinitions="150,*">
           <TextBlock Grid.Row="0" Grid.Column="0" Classes="primary bold" Text="{OnPlatform Ctrl+F, macOS=⌘+F}"/>
           <TextBlock Grid.Row="0" Grid.Column="1" Margin="16,0,0,0" Text="{DynamicResource Text.Hotkeys.TextEditor.Search}" />
 
@@ -142,6 +142,9 @@
 
           <TextBlock Grid.Row="3" Grid.Column="0" Classes="primary bold" Text="ESC"/>
           <TextBlock Grid.Row="3" Grid.Column="1" Margin="16,0,0,0" Text="{DynamicResource Text.Hotkeys.TextEditor.CloseSearch}" />
+
+          <TextBlock Grid.Row="4" Grid.Column="0" Classes="primary bold" Text="{OnPlatform Ctrl+D, macOS=⌘+D}"/>
+          <TextBlock Grid.Row="4" Grid.Column="1" Margin="16,0,0,0" Text="{DynamicResource Text.Hotkeys.TextEditor.OpenExternalMergeTool}" />
         </Grid>
       </StackPanel>
     </Border>