Checkbox likes to play Simon Says

[joaomoreno]

1. Double click a checkbox

🐛 It will repeat what you just did a few milliseconds later

[alexr00]

This happens because we're still waiting to complete the GitHub API calls required for the first click when you make the second click:

1. First click, checkbox is instantly checked. API to mark the file as viewed gets called
2. Second click, checkbox is instantly unchecked. API to mark the file as unviewed gets called
3. First API call marking the file as viewed returns. We check the box because the file is now viewed
4. Second API call marking the file as unviewed returns. We uncheck the box because the file is now unviewed.

Seems like we need some debouncing.