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upas/fs: deal with imap returning more uid's than allocated from previus "messages" command

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

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

@@ -916,7 +916,11 @@

 	f = imap->f;

 	n = imap->nuid;

-	if(n < imap->nmsg) idprint(imap, "partial sync %d < %d\n", n, imap->nmsg);

+	if(n > imap->muid){

+		idprint(imap, "partial sync %d > %d\n", n, imap->muid);

+		n = imap->nuid = imap->muid;

+	} else if(n < imap->nmsg)

+		idprint(imap, "partial sync %d < %d\n", n, imap->nmsg);

 	qsort(f, n, sizeof f[0], (int(*)(void*, void*))fetchicmp);

 	ll = &mb->root->part;

 	for(i = 0; (m = *ll) != nil || i < n; ){