Media Preview on Long Press

[AaronMaria]

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** Describe the feature request below **

It would be nice if you could preview Pictures and Videos on long press on them. So if you press and hold on an image it would be shown fit to screen until you let go.

[beatgammit]

Is this just for posts in the post list, or also for comments?

Related: #658.

[AaronMaria]

I guess ideally both.

[MV-GH]

There is a imageviewer for images even in comments. Videos still need to be supported in a separate viewer

[dessalines]

^^