Feature request: different (alternative) unit of size for widget dimensions

[engelhro]

Having written the previous two tickets, issue #1176 and issue #1177, I'd like to propose one more idea:

What about changing the unit of size for width and height to "%" (percentage) in general, instead of "dp" (which many users might not be able to make sense of anyway)?

For the width there is a natural 100% value defined, and everything narrower could then be shown in % as well (maybe again with a defined raster, e.g. in 5 % steps, see related issue #1176).

And for the height, the 100 % value could represent the useful minimum height required in order to not cut any contents of the widget. I have to admit though that I don't know whether there's a good way at all to determine such a minimum height?

Each widget might behave differently – I've seen ones just scale down (but still get illegible of course when too tiny), and I've seen ones that simply start clipping their content once their height falls below a certain minimum. Maybe some kind of heuristic could be used here in case there's no system supported method of querying a widget's sensible minimum height?