threads: add .ThreadUnread to template data

When a thread is folded, it can be useful to know how many unseen
messages lie below the root. For example, one might want to show that
count in the message list:

column-folded = {{if .ThreadFolded \
	}}{{if ne .ThreadUnread 0 \
		}}{{.ThreadUnread | printf "%s/"}}{{ \
	end}}{{ .ThreadCount | printf "%s"}}{{end}}

Add `.ThreadUnread` to the template functions.

Changelog-added: `.ThreadUnread` is now available in templates.
Signed-off-by: inwit <inwit@sindominio.net>
Acked-by: Robin Jarry <robin@jarry.cc>

0 files changed, 0 insertions, 0 deletions