singleInstance handle command line arguments

Author: GregorBiswanger

Changelog.md

@@ -16,6 +16,7 @@ ElectronNET.API:
 * Breaking API Changes (from native Electron 13.1.5): 
    - `Shell.MoveItemToTrashAsync` renamed with `Shell.TrashItemAsync`  
    - The deprecated extension APIs have been removed: `BrowserWindow.GetAllExtensionsAsync()`, `BrowserWindow.RemoveExtension()`, `BrowserWindow.AddExtensionAsync()`. Use the session APIs instead: `Session.GetAllExtensionsAsync()`, `Session.RemoveExtension()`, `Session.LoadExtensionAsync()`.  
+* New Feature: singleInstance handle command line arguments [\#520](https://github.com/ElectronNET/Electron.NET/issues/520)  
 * New Feature: Add WebContents [insertCSS](https://www.electronjs.org/docs/api/web-contents#contentsinsertcsscss-options) functionality (thanks [nfichter](https://github.com/nfichter)) [\#559](https://github.com/ElectronNET/Electron.NET/pull/559)  
 * New Feature: Allow IpcMain to send IPC messages to BrowserViews (thanks [nfichter](https://github.com/nfichter)) [\#560](https://github.com/ElectronNET/Electron.NET/pull/560)  
 * New Feature: Add support for proxies that require basic username/password authentication (thanks [nfichter](https://github.com/nfichter)) [\#561](https://github.com/ElectronNET/Electron.NET/pull/561)  

ElectronNET.Host/main.js

@@ -50,7 +50,17 @@ app.on('will-finish-launching', () => {
 const manifestJsonFile = require(manifestJsonFilePath);
 if (manifestJsonFile.singleInstance || manifestJsonFile.aspCoreBackendPort) {
     const mainInstance = app.requestSingleInstanceLock();
-    app.on('second-instance', () => {
+    app.on('second-instance', (events, args = []) => {
+        args.forEach(parameter => {
+            const words = parameter.split('=');
+
+            if(words.length > 1) {
+                app.commandLine.appendSwitch(words[0].replace('--', ''), words[1]);
+            } else {
+                app.commandLine.appendSwitch(words[0].replace('--', ''));
+            }
+        });
+
         const windows = BrowserWindow.getAllWindows();
         if (windows.length) {
             if (windows[0].isMinimized()) {