This is still an issue in Ubuntu 20.04 (20.04.1 LTS).
Can't change the language using a shortcut nor via the layout indicator.
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I found out that disabling FXAA (NVIDIA X Server Settings -> X Screen 0 ->
Antialiasing Settings) solves this issue.
Ubuntu 18.10, Gnome 3.30, NVIDIA Driver: 390.87, X-Server: 11.0, GTX 950.
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