Register GoToHandlerAction as a keyboard-assignable VS/ReSharper command with Alt+H default

.gitignore

@@ -28,3 +28,6 @@ _dotTrace*
 /**/.idea
 */**/Packages
 /**/.intellijPlatform
+
+# NuGet tools
+.nuget/

CHANGELOG.md

@@ -1,6 +1,9 @@
 # Changelog
 All notable changes to this project will be documented in this file.
 
+## 26.04.XXXX
+- Fix issue: register `GoToHandlerAction` as a VS/ReSharper keyboard-assignable action with a default shortcut of `Alt+H`. Users can now find it in Tools > Options > Environment > Keyboard as `GoToHandlerAction`.
+
 ## 26.03.07XX
 - Fix issue #93: rename `GoToHandlrAction` kotlin file to `GoToHandlerAction` since this is what is referenced in the plugin.xml file.
 

src/dotnet/MediatorPlugin/Actions/GoToHandlerNavigationAction.cs

@@ -0,0 +1,52 @@
+using JetBrains.Application.DataContext;
+using JetBrains.Application.Shortcuts.ShortcutManager;
+using JetBrains.Application.UI.Actions;
+using JetBrains.Application.UI.ActionsRevised.Menu;
+using JetBrains.Diagnostics;
+using JetBrains.ProjectModel;
+using JetBrains.ReSharper.Feature.Services.Navigation.ContextNavigation;
+using JetBrains.ReSharper.Psi.Tree;
+using ReSharper.MediatorPlugin.Diagnostics;
+using ReSharper.MediatorPlugin.Services.Find;
+using ReSharper.MediatorPlugin.Services.Navigation;
+
+namespace ReSharper.MediatorPlugin.Actions;
+
+#pragma warning disable CS0612
+[Action("GoToHandlerAction", "Go to Handler", ShortcutScope = ShortcutScope.TextEditor, DefaultShortcutText = "Alt+H")]
+#pragma warning restore CS0612
+public class GoToHandlerNavigationAction : IExecutableAction
+{
+    private readonly IHandlerSelector _handlerSelector = new HandlerSelector();
+
+    public bool Update(IDataContext context, ActionPresentation presentation, DelegateUpdate nextUpdate)
+    {
+        var selectedTreeNode = context.GetSelectedTreeNode<ITreeNode>();
+
+        if (selectedTreeNode is not IIdentifier identifier)
+            return nextUpdate.Invoke();
+
+        return _handlerSelector.IsMediatorRequestSupported(identifier);
+    }
+
+    public void Execute(IDataContext context, DelegateExecute nextExecute)
+    {
+        Logger.Instance.Log(LoggingLevel.INFO, "GoToHandlerNavigationAction.Execute called");
+
+        var solution = context.GetComponent<ISolution>();
+        var selectedTreeNode = context.GetSelectedTreeNode<ITreeNode>();
+
+        if (selectedTreeNode is not IIdentifier)
+        {
+            Logger.Instance.Log(LoggingLevel.VERBOSE, "Selected element is not an identifier");
+            return;
+        }
+
+        _handlerSelector.NavigateToHandler
+        (
+            solution,
+            selectedTreeNode,
+            new DataContextNavigationOptionsFactory(context)
+        );
+    }
+}