NewAdwaita Not much contrast between button borders and background
I've been testing NewAdwaita with Geary and looks pretty great! The only issue I have seen is with Geary's inline editor, which has both a GtkHeaderBar and "toolbar" that's actually a GtkBox, both as descendants of a GtkWindow, but with a lot of intervening containers. In both of these, there's not much contrast between the background of the header/box and the buttons they contain.
Compare Adwaita:
With NewAdwaita:
Note that especially for the inline composer's headerbar, but also the toolbar, buttons borders are hard to distinguish. They are both fine when pre-lit.