desktop: Notifications do not stay in notification center

Updated May 23, 2018:

Jira ticket: https://mattermost.atlassian.net/browse/MM-14096

1 - MAC:

See GIF. Desktop notifications appear in the notification center only for the duration of the desktop notification.

Expected: Notification stays in notification center until the notification is read.

2 - LINUX GNOME SHELL: See further discussion at https://github.com/mattermost/desktop/issues/810

Summary When a Mattermost desktop app notifications comes through while Mattermost is in the background, no dot or notification is added to the Gnome notifications area (i.e. the pop-up when you click the date/time at the top of the screen).

Steps to reproduce

• Pop!_OS ($ uname: Linux pop-os 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux)

• Mattermost Desktop App version 4.0.1

• Mattermost Server version 4.0.0 (4.0.1)

• Open Mattermost and login to a server.

• Focus some other program to put Mattermost in the background.

• Receive a notification from Mattermost.

Expected behavior There should be a dot next to the date/time and, when clicked, the notifications popup should have a notification.

Observed behavior There is not dot nor notifications in the pop-up.