high-DPI and visibility of TextEntry border

[hrauch]

Desktop (please complete the following information):

Linux, current pre version of bootstack

Describe the bug

With my display (3840x2160) I can't see borders of not activated TextEntry fields.
Clicking on that field shows the blue shaded borders.
If I set hdpi=False in my AppShell constructor, these borders are visible.

To Reproduce

1. High-DPI Display
2. Create an AppShell,
3. Create a page with add_page
4. Create an TextEntry field
5. Change in AppShell hdpi=False/True

Expected behavior

No response

Screenshots

No response

Additional context

No response

[israel-dryer]

The api is in a pretty rapid state of flux and the moment...from the pre-release, I decided to bite-the-bullet and go all-in on a modern declarative style; removing all of the tk flavors. Tk is still obviously underneath, but the api and usage will be alot cleaner and easier to use. The updated docs should be up and running in the next few days. The widgets where I expect some fairly substantial changes yet are the AppShell and Menubar. The rest I think should be fairly steady to initial general release. I'll make sure to test this before that time. Thanks!