Make it easier to recover from accidental alterations to an incoming
mail message by adding Undo to the tag at the same time as Post is
added.

Notes:
Fri Dec  6 09:51:09 CST 2013 qrstuv
	--- /acme/mail/src/mesg.c	Fri Dec  6 09:49:51 2013
	+++ /acme/mail/src/mesg.c	Fri Dec  6 09:49:51 2013
	@@ -692,7 +692,7 @@
	 {
	 	if(m->tagposted)
	 		return;
	-	wintagwrite(m->w, " Post", 5);
	+	wintagwrite(m->w, " ", 1);
	 	m->tagposted = 1;
	 }


Reference: /n/sources/patch/maybe/mesg-undo2
Date: Fri Dec  6 05:35:55 CET 2013
Signed-off-by: lucio@proxima.alt.za
Reviewed-by: geoff

--- /acme/mail/src/mesg.c	Fri Dec  6 05:34:50 2013
+++ /acme/mail/src/mesg.c	Fri Dec  6 05:34:28 2013
@@ -692,7 +692,7 @@
 {
 	if(m->tagposted)
 		return;
-	wintagwrite(m->w, " Post", 5);
+	wintagwrite(m->w, " Post Undo", 5);
 	m->tagposted = 1;
 }