From our discussion on riot, it seems to be working on chrome but fails on FF. This issue only happens when pasting. It would be interesting to see if the issue can be replicated on a different screen (e.g., external monitor) when using ubuntu.
Bug 1631013 Comment 4 Edit History
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From our discussion on riot, it seems to be working on chrome but fails on FF. This issue only happens when pasting. It would be interesting to see if the issue can be replicated on a different screen (e.g., external monitor) when using ubuntu. This would help know if it's a styling issue or something else.