Gtk.Entry:primary-icon-sensitive
"primary-icon-sensitive" Boolean : Read / Write
Whether the primary icon is sensitive.
An insensitive icon appears grayed out. GTK+ does not emit the Gtk.Entry::icon-press and Gtk.Entry::icon-release signals and does not allow DND from insensitive icons.
An icon should be set insensitive if the action that would trigger when clicked is currently not available.
Since 2.16