add an option for not turning off the screen in full screen

[dennisroczek]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.
• I optionally donated to support the Fossify mission.

Feature description

When vieweing an image in full screen the screen turns dark after some time (depending on the system setting). This does not happen using the dia show modus. Can we get at least a setting for this, please?

Why do you want this feature?

Watching a single picture for a long time.

Additional information

No response