Swipe up on letter key for uppercase variant

[ltguillaume]

Is your feature request related to a problem? Please describe.

The "Swipe from shift to another key to type a single uppercase key" feature is slow and imprecise. Starting from the Shift key, you're already covering almost all of the keyboard with your hand, making it much harder to search for the right key. The desired key can also be missed more easily while sliding than when starting from the key itself.

Describe the solution you'd like

Swipe up from a key to insert the uppercase variant. This will prevent a partly covered keyboard, will allow you find the key as fast as normally is the case and provide a very intuitive way to insert the uppercase variant instead.

Additional context

A keyboard app that already has this feature is good old MultiLing.