No scrolling when the tag is overflow

[richardtks]

Current behavior

When the tags are overflow, user unable to enter the new tag.

Expected behavior

1. When the tags are overflow, its container should able to be scrolled.
2. User should able to enter new tag regardless number of tags existed.

Steps to reproduce

1. Keep entering new tag until it gets overflow.
2. Notice that no scroller even the tags are overflow. [X OK]
3. New tag is not allow anymore. [X OK]

Environment

• Version : master
• OS Version and name : UBuntu LTS 18.04.1 LTS

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[kevgathuku]

This seems to be fixed in #2720

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