Undo/redo functionality

[MiMoHo]

Is your feature request related to a problem? Please describe. Undo feature needed to revert changes before and after they get saved and synced.

Describe the solution you'd like A changelog history in the notes overview to go back in time as well as an undo and redo button to be reached via the 3 dots in the top right note's options.

Describe alternatives you've considered Manual backup of notes – very inconvenient.

[korelstar]

This has two aspects:

1. provide buttons for undo and redo while editing => this will be fixed by implementing #331
2. show a version history => this is already discussed in #144

Since (2.) is a duplicate, let's concentrate on (1.) in this issue. We can keep this open until we've finally implemented #331.

[waltercool]

Up on this.

It's completely not understandable why it doesn't contain any undo funcionality.

I lost so many notes by just a wrong paste or modification, and no way to recover the data.

[nottheend]

I also suffered already many times from overwriting notes 🥲

[juliusknorr]

This has become available with the rich text editor with Nextcloud 26.