[Feature Request] Disable `SPECULATIVE_HOLD` during `LT`

[musjj]

Feature Request Type

• Core functionality
• Add-on hardware support (eg. audio, RGB, OLED screen, etc.)
• Alteration (enhancement/optimization) of existing feature(s)
• New behavior

Description

So I have home row mods like this:

LWIN_T(KC_A), LALT_T(KC_S), LSFT_T(KC_D), LCTL_T(KC_F)

On the same keys, but on a different layer I have one shot mods:

OS_LGUI, OS_LALT, OS_LSFT, OS_LCTL

I switch to this layer using my thumb key: LT(1, KC_SPC).

My config.h looks like this:

#define TAPPING_TERM 250
#define FLOW_TAP_TERM 150
#define CHORDAL_HOLD
#define SPECULATIVE_HOLD

Now when I hit LT(1, KC_SPC) quickly followed by, say, the physical key associated with OS_LCTL and another key, the speculative hold behavior for LCTL_T(KC_F) is still somehow triggered.

This can cause the modifier to be released even when you're physically holding down OS_LCTL.

I've tried to mess around with get_speculative_hold, but in the above scenario I'm only receiving LCTL_T(KC_F) as the keycode (even though I'm holding down OS_LCTL), making it impossible to intercept this behavior.