Add additionalBrowserArguments config option

Author: AshleyScirra

src/Config.cpp

@@ -11,6 +11,7 @@ ConfigJson LoadConfigJson(const std::string& path)
 	ConfigJson ret;
 	ret.startUrl = "https://github.com/WebView-CG/CanIWebView2";
 	ret.preferUnstableChannel = false;
+	ret.additionalBrowserArguments = "";
 
 	// If file does not exist, just use defaults
 	if (!FileExists(path))
@@ -35,5 +36,8 @@ ConfigJson LoadConfigJson(const std::string& path)
 	if (parsedJson.contains("preferUnstableChannel"))
 		ret.preferUnstableChannel = parsedJson["preferUnstableChannel"].get<bool>();
 
+	if (parsedJson.contains("additionalBrowserArguments"))
+		ret.additionalBrowserArguments = parsedJson["additionalBrowserArguments"].get<std::string>();
+
 	return ret;
 }

src/Config.h

@@ -5,6 +5,7 @@
 struct ConfigJson {
 	std::string startUrl;
 	bool preferUnstableChannel;
+	std::string additionalBrowserArguments;
 };
 
 ConfigJson LoadConfigJson(const std::string& path);

src/WebView.cpp

@@ -92,11 +92,18 @@ int CALLBACK WinMain(
 	// The default channel search order is the WebView2 Runtime, Beta, Dev, and Canary (i.e. stable to unstable).
 	// When preferUnstableCannel is true in config.json, set the ChannelSearchKind option to
 	// to COREWEBVIEW2_CHANNEL_SEARCH_KIND_LEAST_STABLE which reverses the channel search order.
+	// See: https://learn.microsoft.com/en-us/microsoft-edge/webview2/how-to/set-preview-channel
 	if (configJson.preferUnstableChannel)
 	{
 		options->put_ChannelSearchKind(COREWEBVIEW2_CHANNEL_SEARCH_KIND_LEAST_STABLE);
 	}
 
+	// Specify additional browser arguments if non-empty string provided
+	if (!configJson.additionalBrowserArguments.empty())
+	{
+		options->put_AdditionalBrowserArguments(Utf8ToWide(configJson.additionalBrowserArguments).c_str());
+	}
+
 	CreateCoreWebView2EnvironmentWithOptions(nullptr, nullptr, options.Get(),
 		Callback<ICoreWebView2CreateCoreWebView2EnvironmentCompletedHandler>(
 			[hWnd, configJson](HRESULT result, ICoreWebView2Environment* env) -> HRESULT {