Implement restoration of dialogs

[oskogstad]

Introduction

A short and concise description of the functionality this issue addresses.

Description

A longer description that accounts for the need, and describes how the functionality should work in detail (in prose form, see also acceptance criteria).

If this is functionality that does not have a clear solution, tag the issue with analysis. The task list then consists of clarification questions.

Implementation

If there are guidelines on architecture or other implementation choices, they are added here. Different approaches can also be discussed here.

Tasks

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1. Implementation tasks are added here
2. Prepare documentation (if relevant - either update working document, or add a new file in docs)
3. Add e2e-test (if relevant)

Threat modelling

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1. Does this change introduce any potential security issues?

Acceptance criteria

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THEN ...

GIVEN ...
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