Drop toolbar style setting from Debug Window
Review Request #1320 — Created March 8, 2022 and submitted
Not only is this using menus (that are removed in GTK4), but there is no toolbar class in GTK4, so this whole option cannot work there.
Anyway, this is a debug window, people really don't need a bunch of options for it.
Compiled without warnings, and ran to see no context menu.
we should probably delete the accompanying purple_prefs_add for this as well.