Add Ctrl + Left click karabiner rule

[raxigan]

• the combination is used to select items/directories in listings
• currently Opt has to be used instead of Ctrl
• I think karabiner variables feature might be helpful here: https://karabiner-elements.pqrs.org/docs/json/complex-modifications-manipulator-definition/to/set-variable/

[raxigan]

For my future self:

There were 3 ideas how to achieve this:

1. Basically remap all Ctrl + LMB clicks to Command + LMB (actually to Opt + LBM because I'm remapping this)

The algorithm:

• set var x to true if Ctrl is pressed/held - most likely alone if possible

• on pressing LMB first press Opt, then click - only if x == true

• start pressing Opt, not once

• set var y = true

• do nothing if y == true

• if Ctrl is released, then set x = false and y = false

• this would be probably done in few separated rules, possibly separated between JetBrains tools and anything else

• no-go because Karabiner-Elements does not support Apple tracking devices so I cannot remap touchpad clicks :/ - so I would end up with rule only working on my mouse, but not on laptop - makes no sense

2. Whenever I hold Ctrl just remap it to Cmd/Opt

• nothing is checked here in terms of mouse, so has some serious impact on ALL Ctrl-based rules
• what does "hold" here even mean? Actually nothing, because I'd like to make it work even if LMB is clicked immediately after Ctrl
• I also want it to work without ANY practical impact on other remappings, quite challenging and also not sure if actually possible
• I'd use Karabiner's "to_if_held_down" here - the hold param is configurable, but as I've said it impacts all Ctrl-based rule, so for example if you hold Ctrl for 2 sec then press C - I should be still able to copy the item
• for all my non-Jetbrains mappings it's fixable (not 100% sure here, there would be plenty of checks here to be made)
• it impacts IJ keymap - I was kinda able to fix it, unfortunately IJ does not have this shortcut entry in they're keymap, so I could have only non-IJ rule - it would simplify things a lot

Summary:

• very complex solution, tons of new rules, I've barely made it work and already seen many issues and potential risks
• impacts not only my rules, but also users' custom rules if there are any
• rules order may matter here

3. Just swap Ctrl and Cmd on system level and rewrite all the configs

• a lot of work, but seems to be 100% reliable
• can be done via terminal
• also fixes multicursor thing in IJ - rather nope
• works immediately, but I have to swap the keys on Karabiner virtual KB in preferences
  - maybe try to restart OS and check what will be the keyboard item in the dropdown in Preferences