bauhuas: remove unneeded gdk lock
gtk3: make active notebook tab visible
gtk3: style for entry boxes.
gtk3: fix black event boxes in light table (weird) and make text entries borderless.
gtk3: make list/tree views visible as boxes
Revert "Bauhaus popup: make sure it is a square too"

That also made bauhaus comboboxes a square.
Bauhaus is not exactly a normal widget(only one init call), that won't
work without some magic. Let's not do it, at least right now.

This reverts commit 6f492149fa1a178579fb38264bb3f00d420c6435.