port browsers to AdwToolbarView and add padding to search entry
The padding is achieved with a GtkSearchBar parent. To avoid disappearing on pressing escape, the GtkSearchEntry is wrapped in an AdwClamp (as seen done here: https://gitlab.gnome.org/GNOME/gnome-control-center/-/blob/main/panels/keyboard/cc-keyboard-shortcut-dialog.ui#L30).
Signed-off-by: Miró Allard miro.allard@pm.me