Realm emojis uploaded before the migration to store the emoji author
information was done don't have any author information. Such emojis
if listed on the settings page caused a traceback.
Fixes: #5133.
If a realm is configured to allow any user to upload a realm emoji
then that user should also be allowed to delete the emoji in case
he feels it doesn't look good or if he uploaded a wrong emoji file.
This commit tweaks the realm emoji settings UI to allow an user who
uploaded an emoji to delete it.
Fixes: #4761.
- Add file_name field to `RealmEmoji` model and migration.
- Add emoji upload supporting to Upload backends.
- Add uploaded file processing to emoji views.
- Use emoji source url as based for display url.
- Change emoji form for image uploading.
- Fix back-end tests.
- Fix front-end tests.
- Add tests for emoji uploading.
Fixes#1134
We now wait to load Organization sections until you
click on the section (or virtually click by using arrow
keys).
Some of the sections are coupled in terms of their setup,
so some sections will already be loaded if you had clicked
on a related section.