closes#5917
- fixes duplication of dropzone event handlers by filtering for an added data-attribute
- avoid running dropzone code if only scrollPosition attr changes
- fix scroll position jump when adding/removing images by only adjusting preview scroll position when editor scroll position changes
closes#5433
- add gh-input class to inputs
- stop the incorrect addition of trash can on url page
- fix trigger of upload success to show loading in editor
- fix duplicate url field for images outside of editor when there is no file storage