Improve file cell height calculation #1448
Merged
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Corresponding server PR:
When the photos app is enabled on the server (read: does not work on sermo), it determines the width and height of an image and stores these informations as metadata. When available we get these information in the file parameter array and can calculate the size of the preview, before even requesting it. This allows us to correctly size the FileMessageTableViewCell upfront and avoid jumping.
Additionally this PR does not use a placeholder image anymore, but instead uses a activity indicator while we load a preview.