* Break out image preparation to its own function.
This is preparatory work to make it easier to handle the thumbnail image
generation in a non-racy way in the Slack command line importer.
* Build preview images sequentially in Slack import.
This removes the use of goroutines from the image preview generation
code run when importing Slack attachments. This slows things down, but
it has important benefits:
1) Avoids a race condition with the goroutines and the command line
exiting.
2) Avoids the problem of massive memory consumption when importing a
Slack channel with a lot of large images attached in quick succession.
Fixes PLT-4442.
* Use mutliple return values instead of struct.
Add function to resize image using resize.Thumbnail. Add function to
resize gif using previous function. Add function to convert image.Image
to image.Palleted. Add logic to identify image type and resize them if
they are larger than MaxEmojiHeight or MaxEmojiWidth. Also increase
MaxEmojiFileSize.
* fix: Add github.com/nfnt to vendor
* fix: Fix max file size and if logic in resizeEmoji
* test: Fix and add new tests for new resize feature
* fix: Fix and update translations to fit new feature
* fix: Add requested changes
* PLT-3762 - Add API call to get a user by their username
* fix lint
* update rote
* update per code review
* update per code review
* remove first/last name is not used in this test
* Added all parameters to call tracker ids when getting profiles
* Changed channel header rendering to not depend on knowing all users in a DM channel
* Added comment about a race condition in UserActions.populateDMChannelsWithProfiles
* Added a fixed-height placeholder for the ChannelHeader when its state isn't valid for rendering
* Don't show desktop notifications for messages entering the channel the user is currently on
Coding style fixes
Allow notifications if browser tab is not focussed
* Don't show desktop notifications for messages entering the channel the user is currently on
Coding style fixes
Allow notifications if browser tab is not focussed
* Mute sound when a user doesn't get a desktop notification
* Also play sound on desktop notifications
* Fixed reviewer's remarks:
* Removed double notification check
* Removed direct links to browser store, created separate actions
This delays updating the url with the new channel until after the modal
is exited which bypasses a state where the center textarea is focused
and then focus is removed due to how react-overlays handles restoring
focus to the last element focused before the modal was shown.
