fix startup delay on linux, (#4379)

* fix startup delay on linux,

by disabling the functions to register DC as protocol handler - on linux this is anyway done by the desktop file

fixes #4350

CHANGELOG.md

@@ -29,6 +29,7 @@
 - the main window overflowing small screens, or/and if zoom level is high #4156
 - do not clear the draft if sending failed. #4340
 - "Search in \<chat name\>" divider overflowing for long chat names #4375
+- fix startup delay on linux #4379
 
 
 <a id="1_48_0"></a>

packages/target-electron/src/open_url.ts

@@ -7,19 +7,22 @@ import { supportedURISchemes } from './application-constants.js'
 import { showDeltaChat } from './tray.js'
 import { ExtendedAppMainProcess } from './types.js'
 import { send, window } from './windows/main.js'
+import { platform } from 'os'
 
 const log = getLogger('main/open_url')
 const app = rawApp as ExtendedAppMainProcess
 
 // Define custom protocol handler. Deep linking works on packaged versions of the application!
 // These calls are for mac and windows, on linux it uses the desktop file.
-app.setAsDefaultProtocolClient('openpgp4fpr')
-app.setAsDefaultProtocolClient('OPENPGP4FPR')
-app.setAsDefaultProtocolClient('dcaccount')
-app.setAsDefaultProtocolClient('DCACCOUNT')
-app.setAsDefaultProtocolClient('dclogin')
-app.setAsDefaultProtocolClient('DCLOGIN')
-// do not forcefully set DC as standard email handler to not annoy users
+if (platform() !== 'linux') {
+  app.setAsDefaultProtocolClient('openpgp4fpr')
+  app.setAsDefaultProtocolClient('OPENPGP4FPR')
+  app.setAsDefaultProtocolClient('dcaccount')
+  app.setAsDefaultProtocolClient('DCACCOUNT')
+  app.setAsDefaultProtocolClient('dclogin')
+  app.setAsDefaultProtocolClient('DCLOGIN')
+  // do not forcefully set DC as standard email handler to not annoy users
+}
 
 let frontend_ready = false
 ipcMain.once('frontendReady', () => {