purge imap_store_t::currentnc vestiges

we always actually open the mailbox before appending to it, so we
obviously know that it exists - that's why the code was already
commented out. changing this assumption would significantly complicate
matters for little gain, so let's just assume it won't happen.

consequently, also don't set param.create when appending to regular
mailboxes.

src/drv_imap.c

@@ -115,8 +115,8 @@ struct imap_cmd;
 typedef struct imap_store {
 	store_t gen;
 	const char *prefix;
-	unsigned /*currentnc:1,*/ trashnc:1;
 	int uidnext; /* from SELECT responses */
+	unsigned trashnc:1; /* trash folder's existence is not confirmed yet */
 	unsigned got_namespace:1;
 	list_t *ns_personal, *ns_other, *ns_shared; /* NAMESPACE info */
 	message_t **msgapp; /* FETCH results */
@@ -1540,10 +1540,8 @@ imap_select( store_t *gctx, int minuid, int maxuid, int *excs, int nexcs,
 
 
 	if (!strcmp( gctx->name, "INBOX" )) {
-//		ctx->currentnc = 0;
 		prefix = "";
 	} else {
-//		ctx->currentnc = 1;	/* could use LIST results for that */
 		prefix = ctx->prefix;
 	}
 
@@ -1698,9 +1696,6 @@ imap_store_msg( store_t *gctx, msg_data_t *data, int to_trash,
 	} else {
 		box = gctx->name;
 		prefix = !strcmp( box, "INBOX" ) ? "" : ctx->prefix;
-		cmd->param.create = (gctx->opts & OPEN_CREATE) != 0;
-		/*if (ctx->currentnc)
-			ctx->caps = ctx->rcaps & ~(1 << LITERALPLUS);*/
 	}
 	ret = imap_exec_m( ctx, cmd, "APPEND \"%s%s\" %s", prefix, box, flagstr );
 	ctx->caps = ctx->rcaps;
@@ -1708,9 +1703,6 @@ imap_store_msg( store_t *gctx, msg_data_t *data, int to_trash,
 		return cb( ret, -1, aux );
 	if (to_trash)
 		ctx->trashnc = 0;
-	else {
-		/*ctx->currentnc = 0;*/
-	}
 
 	return cb( DRV_OK, uid, aux );
 }