[Enhancement] Make Hold-Tap work with transparent keycodes

[hariganti]

Describe the bug
When using hold-tap (KC.HT(KC.TAP, KC.HOLD)), using KC.TRNS for the tap action doesn't properly send the keycode that should be sent.

To Reproduce
Steps to reproduce the behavior:

from kmk.keys import KC
CUST = KC.HT(KC.TRNS, KC.LCTL)
Keyboard.keymap = [
  [ ... KC.A, KC.B ... ],
  [ ... CUST, CUST ... ]
]

1. Activate second layer
2. Press 'B'
3. Press 'A'
4. Release 'A'
5. Release 'B'

Expected behavior
Control + A (select all) should be the result

Debug output
No output available at this time

Additional context
What I'd like to do is have a layer with home row mods, so holding a key will momentarily enable that layer, then holding one of the hold-tap keys will give me the desired modifier. As I have other layers, using the transparency keycode for the tap function is desirable since it will allow me to use the home row mods on whichever layer I was actively using before activating the momentary layer. This is also why I can't just do something like, KC.HT(KC.A, KT.LCTL), since that won't allow me to use control as a modifier on all layers

[xs5871]

That's a feature request. The transparent key resolution happens at a completely different part of the code.

[hariganti]

Thanks for the correction. It appeared like a bug since I didn't see anything to indicate that the transparency keycode couldn't be used there in the way I tried