Desktop: let the arrows choose the host the drawer acts on, and Enter connect to it

tests/DodoSSH.Client.App.Layout.Tests/HostGridTests.cs

@@ -465,6 +465,61 @@ public sealed class HostGridTests : IAsyncLifetime
         });
     }
 
+    /// <remarks>
+    /// The arrows' half of the selection. The cards' <c>SelectedItem</c> is one-way, so a card the keyboard lit
+    /// used to stay out of the vault — and the drawer's CONNECT and DELETE then acted on the card clicked
+    /// before it, the mistake <see cref="ARightClickSelectsTheHostUnderThePointer"/> is about.
+    /// </remarks>
+    [Fact]
+    public async Task TheArrowsMoveTheVaultsSelection_AndEnterConnectsToIt()
+    {
+        await OnTheBoardAsync((screen, window) =>
+        {
+            var first = Row(vault, "prod-db");
+            var other = Row(vault, "stage-web");
+
+            Click(CardFor(screen, first), window);
+            vault.SelectedHost.ShouldBeSameAs(first);
+
+            window.KeyPressQwerty(PhysicalKey.ArrowRight, RawInputModifiers.None);
+            Dispatcher.UIThread.RunJobs();
+
+            vault.SelectedHost.ShouldBeSameAs(other, "the card the arrow lit, not the one clicked before it");
+
+            vault.ConnectCommand.ExecutionTask.ShouldBeNull();
+
+            window.KeyPressQwerty(PhysicalKey.Enter, RawInputModifiers.None);
+            Dispatcher.UIThread.RunJobs();
+
+            // The command, not a connection: these hosts were saved with nothing to sign in with, so it stops
+            // at saying so — about the card Enter was pressed on, which is the selection checked above.
+            vault.ConnectCommand.ExecutionTask.ShouldNotBeNull("Enter on a card is the double-press");
+        });
+    }
+
+    /// <remarks>
+    /// The board is where this screen puts the keyboard, and none of the section lists inside it has it until
+    /// a card has been clicked — so without this an arrow pressed on arriving went nowhere at all.
+    /// </remarks>
+    [Fact]
+    public async Task AnArrowOnTheBoardItselfGoesIntoTheCards()
+    {
+        await OnTheBoardAsync((screen, window) =>
+        {
+            vault.SelectedHost = null;
+
+            screen.Board.Focus();
+            Dispatcher.UIThread.RunJobs();
+
+            window.KeyPressQwerty(PhysicalKey.ArrowDown, RawInputModifiers.None);
+            Dispatcher.UIThread.RunJobs();
+
+            var focused = window.FocusManager!.GetFocusedElement().ShouldBeOfType<ListBoxItem>();
+
+            vault.SelectedHost.ShouldNotBeNull().ShouldBeSameAs(focused.DataContext);
+        });
+    }
+
     // ---- Helpers ----
 
     private static void RightClick(Visual card, Visual window)