TryGhost / Ghost-Admin / 4423

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Optimised gallery image upload previews (#1079)

no issue
- use `URL.createObjectURL(file)` to get a blob url rather than using `FileReader.readAsDataURL` which generates a very large data attribute
- speeds up the display of previews and associated browser hangs when an upload finishes, especially noticeable with large images and fast connections where multiple uploads finish around the same time

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