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Mail: correct rendering of nested multipart messages

Reading nested subparts of messages into the root
message array allows deeply nested multipart trees
of messages to show correctly in the message view.

--- a/sys/src/cmd/upas/Mail/mesg.c

+++ b/sys/src/cmd/upas/Mail/mesg.c

@@ -136,7 +136,7 @@

 }

 static Mesg*

-readparts(Mesg *m)

+readparts(Mesg *r, Mesg *m)

 {

 	char *dpath, *apath;

 	int n, i, dfd;

@@ -168,18 +168,18 @@

 		if(a == nil)

 			continue;

 		if(strncmp(a->type, "multipart/", strlen("multipart/")) == 0){

-			sub = readparts(a);

+			sub = readparts(r, a);

 			if(sub != a)

 				m->body = sub;

 			continue;

 		} 

-		if(m->nparts >= m->xparts)

-			m->parts = erealloc(m->parts, (2 + m->nparts*2)*sizeof(Mesg*));

-		m->parts[m->nparts++] = a;

-		if(m->body == nil && strcmp(a->type, "text/plain") == 0)

-			m->body = a;

-		else if(m->body == nil && strcmp(a->type, "text/html") == 0)

-			m->body = a;

+		if(r->nparts >= r->xparts)

+			r->parts = erealloc(r->parts, (2 + r->nparts*2)*sizeof(Mesg*));

+		r->parts[r->nparts++] = a;

+		if(r->body == nil && strcmp(a->type, "text/plain") == 0)

+			r->body = a;

+		else if(r->body == nil && strcmp(a->type, "text/html") == 0)

+			r->body = a;

 	}

 	free(d);

 	if(m->body == nil)

@@ -532,7 +532,7 @@

 	int rfd;

 	Mesg *b;

-	b = readparts(m);

+	b = readparts(m, m);

 	path = estrjoin(mbox.path, b->name, "body", nil);

 	if(strcmp(b->type, "text/html") == 0)

 		rfd = htmlfmt(m, path);