detect_key_down_uninterruptedly significantly delays input

[caillou]

As always, first things first: I love this project! Thanks for the effort going into this!

I an very well aware, that my issue is an edge-case. But I thought you still might want to know.

The input of my implementation of SpaceFN + i -> up_arrow is significantly delayed.

This delay appears as soon as I add detect_key_down_uninterruptedly.

The reason I added detect_key_down_uninterruptedly, is that modifier keys seem to interrupt the simultaneous input of space + i.

Is there another way to avoid that modifier keys interrupt the simultaneous input?

{
  "description": "SpaceFN",
  "manipulators": [
    {
      "conditions": [
        {
          "name": "SpaceFN",
          "type": "variable_if",
          "value": 0
        }
      ],
      "from": {
        "modifiers": {"optional": ["any"]},
        "simultaneous": [
          { "key_code": "spacebar" },
          { "key_code": "i" }
        ],
        "simultaneous_options": {
          "key_down_order": "strict",
          "key_up_order": "strict_inverse",
          "detect_key_down_uninterruptedly": true,
          "to_after_key_up": [{
              "set_variable": {
                "name": "SpaceFN",
                "value": 0
              }
            }]
        }
      },
      "parameters": {
        "basic.simultaneous_threshold_milliseconds": 10000
      },
      "to": [
        {
          "set_variable": {
            "name": "SpaceFN",
            "value": 1
          }
        },
        {
          "key_code": "up_arrow"
        }
      ],
      "type": "basic"
    },
    {
      "conditions": [
        {
          "name": "SpaceFN",
          "type": "variable_if",
          "value": 1
        }
      ],
      "from": {
        "key_code": "i",
        "modifiers": {
          "optional": ["any"]
        }
      },
      "to": [ { "key_code": "up_arrow" } ],
      "type": "basic"
    }
  ]
}

[tekezo]

With detect_key_down_uninterruptedly enabled, all key events, even those unrelated to simultaneous, must be delayed uniformly, so this behavior is intentional.
If a specific key is causing the issue, try adding a version of simultaneous that includes that key in addition to your existing rules.

[caillou]

Thanks for your quick response.

I understand that keypresses other than the ones registered a simultaneous need to be buffered.

What I was wondering is, if there is a reason for massive delay happening when just pressing the keys that are intended to be simultaneous (and strict in order), e.g. just pressing space + i.

[tekezo]

This parameter controls the delay, so the optimal value is the smallest one at which you can reliably perform simultaneous key presses.

        "basic.simultaneous_threshold_milliseconds": 50