Andreas Kling a8a899adbf WindowServer+LibGUI: Make much of menu construction asynchronous ...

Creating a menu/menubar needs to be synchronous because we need the
ID from the response, but adding stuff *to* menus (and adding menus
to menubars, and menubars to windows) can all be asynchronous.

This dramatically reduces the amount of IPC ping-pong played by
each GUI application during startup.

I measured how long it takes TextEditor to enter the main event loop
and it's over 10% faster here. (Down from ~86ms to ~74ms)

2021-05-03 21:56:13 +02:00

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