add a way to select an autocompletion suggestion using physical keyboard

[Ivan]

Some times I use Onboard just for its autocompletion facility while using a physical keyboard to actually type the text. This usage scenario would be made much much more easy and efficient if I could choose an autocompletion suggestion by means of a physical key press. For example we can number the suggestions and let pressing a number key select the relevant suggestion (suggestions don't make much sense when typing in numbers so this will not conflict with normal numbers input and there is no need in using a modifier or inventing other ways).

[Ivan (ivan-mashchenko)]

This is a low-priority feature request though I don't know how to label it appropriately.