feature: add context menu for selected change in stashes page

src/ViewModels/StashesPage.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Threading.Tasks;
 
 using Avalonia.Controls;
@@ -150,6 +151,74 @@ namespace SourceGit.ViewModels
             return menu;
         }
 
+        public ContextMenu MakeContextMenuForChange(Models.Change change)
+        {
+            if (change == null)
+                return null;
+
+            var diffWithMerger = new MenuItem();
+            diffWithMerger.Header = App.Text("DiffWithMerger");
+            diffWithMerger.Icon = App.CreateMenuIcon("Icons.OpenWith");
+            diffWithMerger.Click += (_, ev) =>
+            {
+                var toolType = Preference.Instance.ExternalMergeToolType;
+                var toolPath = Preference.Instance.ExternalMergeToolPath;
+                var opt = new Models.DiffOption($"{_selectedStash.SHA}^", _selectedStash.SHA, change);
+
+                Task.Run(() => Commands.MergeTool.OpenForDiff(_repo.FullPath, toolType, toolPath, opt));
+                ev.Handled = true;
+            };
+
+            var fullPath = Path.Combine(_repo.FullPath, change.Path);
+            var explore = new MenuItem();
+            explore.Header = App.Text("RevealFile");
+            explore.Icon = App.CreateMenuIcon("Icons.Explore");
+            explore.IsEnabled = File.Exists(fullPath);
+            explore.Click += (_, ev) =>
+            {
+                Native.OS.OpenInFileManager(fullPath, true);
+                ev.Handled = true;
+            };
+
+            var resetToThisRevision = new MenuItem();
+            resetToThisRevision.Header = App.Text("ChangeCM.CheckoutThisRevision");
+            resetToThisRevision.Icon = App.CreateMenuIcon("Icons.File.Checkout");
+            resetToThisRevision.Click += (_, ev) =>
+            {
+                new Commands.Checkout(_repo.FullPath).FileWithRevision(change.Path, $"{_selectedStash.SHA}");
+                ev.Handled = true;
+            };
+
+            var copyPath = new MenuItem();
+            copyPath.Header = App.Text("CopyPath");
+            copyPath.Icon = App.CreateMenuIcon("Icons.Copy");
+            copyPath.Click += (_, ev) =>
+            {
+                App.CopyText(change.Path);
+                ev.Handled = true;
+            };
+
+            var copyFileName = new MenuItem();
+            copyFileName.Header = App.Text("CopyFileName");
+            copyFileName.Icon = App.CreateMenuIcon("Icons.Copy");
+            copyFileName.Click += (_, e) =>
+            {
+                App.CopyText(Path.GetFileName(change.Path));
+                e.Handled = true;
+            };
+
+            var menu = new ContextMenu();
+            menu.Items.Add(diffWithMerger);
+            menu.Items.Add(explore);
+            menu.Items.Add(new MenuItem { Header = "-" });
+            menu.Items.Add(resetToThisRevision);
+            menu.Items.Add(new MenuItem { Header = "-" });
+            menu.Items.Add(copyPath);
+            menu.Items.Add(copyFileName);
+
+            return menu;
+        }
+
         public void Clear()
         {
             if (PopupHost.CanCreatePopup())

src/Views/StashesPage.axaml

@@ -136,7 +136,7 @@
 
         <ListBox.ItemTemplate>
           <DataTemplate DataType="m:Change">
-            <Grid ColumnDefinitions="24,*">
+            <Grid ColumnDefinitions="24,*" Background="Transparent" ContextRequested="OnChangeContextRequested">
               <v:ChangeStatusIcon Grid.Column="0" Width="14" Height="14" Change="{Binding}"/>
               <TextBlock Grid.Column="1" Classes="primary" Text="{Binding Path}" Margin="4,0,0,0"/>
             </Grid>

src/Views/StashesPage.axaml.cs

@@ -18,5 +18,15 @@ namespace SourceGit.Views
             }
             e.Handled = true;
         }
+
+        private void OnChangeContextRequested(object sender, ContextRequestedEventArgs e) 
+        {
+            if (DataContext is ViewModels.StashesPage vm && sender is Grid grid)
+            {
+                var menu = vm.MakeContextMenuForChange(grid.DataContext as Models.Change);
+                grid.OpenContextMenu(menu);
+            }
+            e.Handled = true;
+        }
     }
 }