Kap: Touch Bar bugs

[Qix-]

Platform: MacOS
Kap Version: c11e02eb567b4c1552fa6beec0d7245134aa342d

Steps to reproduce

( Requires Macbook Touchbar or emulator)

1. Open Kap
2. Tap Crop
3. Tap Record
4. Tap Record (again)
5. Try to click Kap icon in menu bar
6. Click Record
7. Try to do anything else with Kap

Current behaviour

A number of things:

1. Record touchbar button doesn't switch to Stop or Finish or anything
2. Record touchbar button seems to start new recordings even though there's one ongoing
3. The Kap menubar widget freezes/lags and appears to remain in the "cropping" stage even though (after the above repro steps) the icon shows that it's recording

Expected behaviour

Normal record flow, just with the touchbar.

Workaround

Don't use touchbar :trollface:

// cc @vadimdemedes since I believe he added the original touchbar functionality.

[sindresorhus]

( Requires Macbook Touchbar)

If someone without a Touch Bar wants to help out, they can use https://github.com/sindresorhus/touch-bar-simulator

[catalinmiron]

@Qix- @sindresorhus just opened a PR for fixing this bug. Please take a look at #460. Thanks!