Group multiple images in one message - collage / canvas / grid layout

[bentuna]

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Feature request

Which Nextcloud Version are you currently using: 33

Is your feature request related to a problem? Please describe.
When you post multiple images, they get posted as individual messages and only the last one gets the caption attached. This clutters the chat and also rips the caption out of context - because usually the caption is meant for all the images as a whole.

Describe the solution you'd like
Grouping the images in a single message/bubble like every modern messenger does:

Additional context
Really cool would be to keep the ability to reply to each image individually - not just to the whole message.

[Antreesy]

Wip, need to think of the way to show it when mixed with non-image files