Don't show loading skeleton each time a known message is opened #10749
Description
Is your feature request related to a problem? Please describe.
There is a loading skeleton each time a message is opened which has already been opened before. The data is available in the frontend and shouldn't change as we already do HTTP level caching on the api/messages/{id}/body response.
Describe the solution you'd like
The skeleton should only be shown if the message is not yet known.
Describe alternatives you've considered
No response
Additional context
No response