Help: Use LibWeb to open files via RequestServer

Author: https://github.com/LucasChollet
Commit: 0c2dc6be66
Pull-request: https://github.com/SerenityOS/serenity/pull/13870
Issue: https://github.com/SerenityOS/serenity/issues/5259
Reviewed-by: https://github.com/Dexesttp
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/petelliott

Userland/Applications/Help/main.cpp

@@ -33,6 +33,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil("/usr/share/man", "r"));
+    TRY(Core::System::unveil("/tmp/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil("/tmp/portal/launch", "rw"));
     TRY(Core::System::unveil("/tmp/portal/webcontent", "rw"));
     TRY(Core::System::unveil(nullptr, nullptr));