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plan9: make sure to include filename length into linebuf allocation logic

--- a/plan9.c

+++ b/plan9.c

@@ -1496,7 +1496,7 @@

 	field_init_fill(&fscr, h, w, '.');

 	field_init(&fsel);

-	linebuf = malloc(sizeof(Rune)*MAX(w+1, 64));

+	linebuf = malloc(sizeof(Rune)*MAX(w+1, 64+strlen(filename)));

 	memset(noteoff, 0, sizeof(noteoff));

 	mbuf_reusable_init(&mbuf);

@@ -1840,7 +1840,7 @@

 				memmove(&mscr.buffer[n*w], &mbuf.buffer[n*oldw], MIN(w, oldw));

 			mbuf_reusable_ensure_size(&mbuf, h, w);

 			memmove(mbuf.buffer, mscr.buffer, w*h);

-			linebuf = realloc(linebuf, sizeof(Rune)*MAX(w+1, 64));

+			linebuf = realloc(linebuf, sizeof(Rune)*MAX(w+1, 64+strlen(filename)));

 			field_copy(&field, &fscr);

 			field_resize_raw(&field, h, w);