Keyboard visible on opening drawer

[tronku]

Describe the bug
If one opens the nav drawer while typing, the keyboard remains visible due to which the below options of the drawer aren't accessible.

To Reproduce
Focus on the edittext in the TextArtFragment and then open the drawer.

Expected behavior
The soft keyboard should automatically hide.

Screenshots

Smartphone Info:

Device	Mi Note 5
Android Version	Oreo 8.1

Would you like to work on the issue?
Yes