Scroll beyond the visible plots in the matplotlib view

# Feature Description

**Aim to not delete parts of the template.**

[comment]: <> (FILL IN BELOW)
As a user, I would like to be able to scroll back beyond just the visible plots in the matplotlib view.~~~

## Explanation
As a user, I would like to be able to scroll back beyond just the visible plots in the matplotlib view.

[comment]: <> (FILL IN BELOW)

### Additional Information

As a user, I would like to be able to scroll back beyond just the visible plots in the matplotlib view.

- _Where required files/links are_
- _Describe any potential difficulties with this ticket_
- _Provide links to tickets that must be completed before starting_
- _Provide any images that would be relevant to the ticket_

_{_If not applicable, write "Not applicable"_}

[comment]: <> (FILL IN BELOW)
> ...

_{See our [Git Workflow](https://github.com/ISISComputingGroup/ibex_developers_manual/wiki/Git-workflow#development-work).}

# Acceptance Criteria
_{What is the acceptance criteria of this ticket? What should the reviewer expect to be complete?}
- _Define specific conditions that must be met for the feature to be considered complete_
- _Use bullet points for clarity_
- _Ensure each criterion is unique, testable and verifiable_
- [ ] I would like to be able to scroll back beyond just the visible plots in the matplotlib view.

[comment]: <> (FILL IN BELOW)
> ...

# How to Review
_{Before making a PR...}
- _Provide verbose instructions for the reviewer to test your changes_
- _Describe how you have implemented testing for this feature_
- _Provide screenshots of the feature to help the reviewer if relevant_
Check that I can scroll back beyond just the visible plots in the matplotlib view.

_{_If not applicable, write "Not applicable"_}

[comment]: <> (FILL IN BELOW)
> ...

_{**To the reviewer: Make sure to [update submodules](https://github.com/ISISComputingGroup/ibex_developers_manual/wiki/Git-workflow#reviewing-work-for-the-submodules-of-epics)!**}

Es werden keine Dateien, Tests, Voraussetzungen oder Implementierungsdetails genannt. Finde die matplotlib-Ansicht im Repository und reproduziere zunächst ihr aktuelles Scrollverhalten. Die Arbeit ist abgeschlossen, wenn Benutzer über die derzeit sichtbaren Plots hinaus zurückscrollen können und dieses Verhalten in der Ansicht verifiziert werden kann.

Vom Indexierungsmodell aus dem Issue-Text verfasst.