user32.keybd_event trigger a release for modifiers, which makes send function glitched

[SunOfJudge]

It seems that on windows platform _os_keyboard eventually calls user32.keybd_event.
However, it makes the pressed modifiers to release for some reason.
Note that modifiers and non-modifiers are different and this affect only modifiers.
You can replicate it through the following code:

import keyboard, time
while True:
    time.sleep(2)
    keyboard._os_keyboard.press(keyboard.key_to_scan_codes("right")[0])

Hold shift key and run the code, you will find that the text cursor moves but the text is not selected, which is a proof that the shift key is released for a sudden.
This can be patched by modifying send function.

[girvile]

I think because right is an extended key (0xE05D), it is misread. maybe this can fix your problem: #606