Remove unused import
Remove size limit for preview.
Limit preview to non big images.
Remove import
Fix tooltip. Arbitrary Limit was still displayed.
Review loading sequence

When selecting image in sequence, the flag "isLargeImage" was
returning the value associated to the previous image selected
This led to big image being displayed in preview.
Sequence has been modified to avoid such situation.
Merge pull request #2722 from jburel/rebased/develop/preview-size

Preview size (rebased onto develop)