I came to know that I have an AlaDelta theme sitting/hiding somewhere on the system. I tried the following approaches -
$ apt-file search aladelta
with variations of aladelta in some caps, all caps but no avail.
$ aptitude search aladelta
Also tried various theme packages which I have installed to see if one of them might have this theme but it's a long slog.
[$] dpkg -l | grep -i theme
Any ideas how to figure out where this theme might be holed up ?
[~/.config/gtk-3.0] -  └─[$] cat settings.ini [Settings] gtk-theme-name=AlaDelta gtk-icon-theme-name=matefaenzagray gtk-font-name=Sans 12 gtk-cursor-theme-name=DMZ-Black gtk-cursor-theme-size=48 gtk-toolbar-style=GTK_TOOLBAR_BOTH_HORIZ gtk-toolbar-icon-size=GTK_ICON_SIZE_LARGE_TOOLBAR gtk-button-images=1 gtk-menu-images=1 gtk-enable-event-sounds=0 gtk-enable-input-feedback-sounds=0 gtk-xft-antialias=1 gtk-xft-hinting=1 gtk-xft-hintstyle=hintmedium gtk-xft-rgba=none gtk-application-prefer-dark-theme=1
This has become an issue as the theme is supposed to be a fork of adwaita and is obsolete by many years. I came to know about it as it started giving gtk warnings as just have upgraded to gtk-3.20 .