Open a database when changing keyboard

**Is your feature request related to a problem? Please describe.**
When no database is open and you switch to the Magikeyboard, there is an extra step to open a database with the key button.

**Describe the solution you'd like**
Setting to shortcut when change keyboard to Magikeyboard and database not opened, directly go through database opening.

Start by tracing the Magikeyboard switch flow and the existing key-button database-opening flow. Clarify how the requested setting should behave, then verify that switching to Magikeyboard with no database open reaches database opening without the extra key-button step.

Written by the indexing model from the issue text.