show version differences

[meonkeys]

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Is your feature request related to a problem? Please describe.

When someone else changes a file it would be handy to be able to see exactly what changes they made. I suggest a way to visualize these differences.

Here's an idea for how to roll it out in phases:

1. support for diffs (version delta visualizations) for plain text (.txt, markdown) files
2. support for diffs of calendar events
3. support for diffs of address book contacts
4. support for diffs of tasks

Describe the solution you'd like

The initial and easiest UI/UX could just be a new window that pops up whenever you click on a version entry for a file, and this opens a new window with a unified text diff to the previous version.

The next evolution of this UI/UX could follow along the lines of, for example, Google Docs.

Describe alternatives you've considered

I've considered delegating the version storage and diff generation to something like git. This would work fine for text files.

[skjnldsv]

duplicate of #39140