Summary:
consolidate all the "untitled" stuff into a convenience method on the File itself. Previously it'd show "Unnamed Attachment", download as "Untitled" and open as "<file.id>". Now it's consistent everywhere and chooses names based on the contenttype (Event.ics).
Rewrite CSS rules for uploads and attachments to be simpler
- remove container divs and classnames from things that have no CSS
- switch to using Flexbox so it's not necesary to have so many containers
- remove zIndex hacks, apply overflow rules to name div only, so long filenames don't make action button unclickable
- consolidate CSS classnames for uploads/attachments
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Other style fixes
- cursor "default" instead of text insertion on image attachments
- cursor "default" on action buttons
- image uplaods / attachments with long filenames truncate with ellpsis
- attachments are not indented by an extra 15px in message bodies
Prevent progress bar overflow (was ending above 100%, 100.12315%...)
Update FileDownloadStore so it never creates Download objects when file is downloaded already
- Previously, the download itself decided if it would be a no-op, but this meant the download was around for a split second and you'd see progress indicators flash for a moment when opening/saving an attachment.
Upgrade FileDownloadStore use of promises
Restore Image attachment drag and drop - was broken because the name gradient thing was covering the entire drag region.
Allow file attachments to be drag and dropped to the finder and other applications 😍😍😍
Test Plan: Tests still pass
Reviewers: evan
Reviewed By: evan
Differential Revision: https://phab.nylas.com/D1745