Keep image settings after changing image

## Bug description

In the editor mode of the Developer Portal you need to work with images and configure them.
But replacing an image with a newer version of said image resets the size formatting.
The "styling", "caption" and "link to" remain the same but not the size formatting.

Keeping the size-settings will increase work efficiency and decrease the chance of mistakes.

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@AnRei123

Start by reproducing the issue in the Developer Portal editor: configure an image, replace it with a newer version, and observe which settings persist. Trace the image-replacement entry point and identify the handling of size formatting. Done means replacing an image preserves its size settings as well as styling, caption, and link settings.

Written by the indexing model from the issue text.