OSK should reappear when swiping from the bottom

[Paul Sonnenschein]

Used device/os:
bq aquaris m10 / OTA-11

Used Package (click):
com.ubuntu.terminal 0.7.198

Observed behaviour:
When moving down the OSK it can be shown again using the button, but it can not be pulled up. The only way to let it reappear is using the button.

Expected behaviour:
The OSK can be pulled up. Eventually, the button is removed and the keyboard gets a hint.

Reasoning:
The OSK can be pushed down. Since showing the keyboard is the inverse action of moving it down, pulling it up is the inverse of pushing it down. Also pulling in things from the bottom edge is part of the design of Ubuntu Touch. Why should one not be able to pull up the keyboard from there in this case? Because of that I expect that the keyboard can be pulled up, although there is a button for this.