Description:

Directory does not list all channels when placing Rocket.Chat on a monitor in portrait mode (resolution based).

Server Setup Information:

• Version of Rocket.Chat Server: 0.62.1
• Operating System: Ubuntu 16.04.3 LTS
• Deployment Method(snap/docker/tar/etc): Snap
• Number of Running Instances: 1
• DB Replicaset Oplog: Enabled
• Node Version: v8.8.1
• mongoDB Version: ?

Steps to Reproduce:

1. Place Chrome tab in fullscreen on a monitor in portrait mode (with height more than ~1200 pixels)
2. Click directory button

Expected behavior:

All the channels available should be listed

Actual behavior:

Few channels are listed, and cannot scroll further. Sorting by name "works" since the end of the channel list appears at the top, but scrolling is still not possible.

Additional information

Different resolutions changes the behaviour:
1920x1200 (landscape) Works
1200x1920 (portrait) Doesn't work

Resolutions tested on the same monitor with same orientation:
2560x1440 (landscape) Doesn't work
1920x1080 (landscape) Works

So it would seem that the resolution is the culprit in this case,.