Protection against unexpected loss of modifications

[muonw]

Is your feature request related to a problem? Please describe.
By default, edits are performed locally. Therefore, actions such as leaving the page or reloading the datasets will discard the edits.

Describe the solution you'd like
Asking for user's confirmation of such actions can avoid unexpected loss of changes. Additionally, a mechanism can be implemented to allow reading and setting the state of edits (whether a change is saved or not) programmatically.