Fake-ungrab keyboard to speed up toggling speed with "Keyboard" machine (X)

[user202729]

Note: This is something that I no longer use, and is no longer maintained.

Previously (when I was using a keyboard as the input method/machine for Plover, I was annoyed that the time Plover takes to enable/disable the machine (PHROLG) can sometimes take up to half a second. (and also because of the (now fixed) bug of display locking, it frequently freezes)

I implemented https://github.com/user202729/plover/tree/fake-ungrab that, rather than ungrabbing the keyboard on toggle, just pretend that it's ungrabbed but actually forward/re-emulates the received key presses.

Note that this is incompatible with a recent version of Plover, doesn't have several new features, and only useful on X (Linux).

For some reasons when I run the old code (with or without the patch), the toggle speed is almost instantaneous.
So I'm just going to leave this here.