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upasfs: make imap debug logging less noisy

The current logging prints a debug line for every
message in an inbox, which is unusably verbose.
This removes the prints for unchanged messages,
and adds a print for flag changes.

--- a/sys/src/cmd/upas/fs/imap.c

+++ b/sys/src/cmd/upas/fs/imap.c

@@ -979,7 +979,6 @@

 				m->imapuid = strtoull(m->idxaux, 0, 0);

 			c = vcmp(f[i].uid, m->imapuid);

 		}

-		idprint(imap, "consider %U and %U -> %d\n", i<n? f[i].uid: 0, m? m->imapuid: 1, c);

 		if(c < 0){

 			/* new message */

 			idprint(imap, "new: %U (%U)\n", f[i].uid, m? m->imapuid: 0);

@@ -1006,8 +1005,10 @@

 			m->deleted = Disappear;

 			ll = &m->next;

 		}else{

-			if((m->flags & ~Frecent) != (f[i].flags & ~Frecent))

+			if((m->flags & ~Frecent) != (f[i].flags & ~Frecent)){

+				idprint(imap, "modified: %d != %d\n", m->flags, f[i].flags);

 				m->cstate |= Cmod;

+			}

 			m->flags = f[i].flags;

 			ll = &m->next;

 			i++;