Log action dispatch occurrence

src/cascadia/TerminalApp/ShortcutActionDispatch.cpp

@@ -19,6 +19,20 @@ using namespace winrt::TerminalApp;
 
 namespace winrt::TerminalApp::implementation
 {
+    std::wstring ExtractAction(const ActionAndArgs& actionAndArgs)
+    {
+        // Formatted as "User.{action}" or "User.{action}.{hash}"
+        const auto id = actionAndArgs.GenerateID();
+        std::wstring_view remaining{ id };
+
+        // Throw away "User."
+        std::ignore = til::prefix_split(remaining, L'.');
+
+        // Get the "{action}" part
+        const auto actionName = til::prefix_split(remaining, L'.');
+        return std::wstring{ actionName };
+    }
+
     // Method Description:
     // - Dispatch the appropriate event for the given ActionAndArgs. Constructs
     //   an ActionEventArgs to hold the IActionArgs payload for the event, and
@@ -49,7 +63,20 @@ namespace winrt::TerminalApp::implementation
         default:
             return false;
         }
-        return eventArgs.Handled();
+        const auto handled = eventArgs.Handled();
+
+        if (handled)
+        {
+            TraceLoggingWrite(
+                g_hTerminalAppProvider,
+                "ActionDispatched",
+                TraceLoggingDescription("Event emitted when an action was successfully performed"),
+                TraceLoggingValue(ExtractAction(actionAndArgs).data(), "Action"),
+                TraceLoggingKeyword(MICROSOFT_KEYWORD_MEASURES),
+                TelemetryPrivacyDataTag(PDT_ProductAndServiceUsage));
+        }
+
+        return handled;
     }
 
     bool ShortcutActionDispatch::DoAction(const ActionAndArgs& actionAndArgs)

src/cascadia/TerminalSettingsModel/Command.idl

@@ -30,6 +30,8 @@ namespace Microsoft.Terminal.Settings.Model
 
         IActionArgs Args;
         ShortcutAction Action;
+
+        String GenerateID();
     };
 
     [default_interface] runtimeclass Command : ISettingsModelObject