to make those distinguishable from other highlighted buttons.
The border at the bottom makes it look like a stack of buttons
that will be put into position when tapping the view-changing buttons.
Part-of: <https://gitlab.gnome.org/World/Phosh/squeekboard/-/merge_requests/635>
It is rectangular now,
there are less layout-changes when switching views,
and some commonly used symbols are more easily available.
Before this change, the arrangement of the keys was different between
the normal layout and the wide layout.
The wide layout can now move to the "eschars"-view, like the normal layout.
Part-of: <https://gitlab.gnome.org/World/Phosh/squeekboard/-/merge_requests/627>
Currently this differs for the same view-change-keys in different layouts.
When the text is "abc", the size of the key's text changes
when toggling between "123" and "abc"; with the text "ABC",
the size remains about the same.
Part-of: <https://gitlab.gnome.org/World/Phosh/squeekboard/-/merge_requests/611>
A big letter after a small letter looks incorrect on a keyboard,
because that is not normal German grammar and a keyboard is for
inputting text.
The key is also on the left side of the layout,
which makes äÄ not fit the visual flow.
Part-of: <https://gitlab.gnome.org/World/Phosh/squeekboard/-/merge_requests/611>
