commit 748d5cab9a3d0d5d0edc28c8fd38430c684b1e55
from: Christian Weisgerber <naddy@mips.inka.de>
date: Mon Dec 14 22:15:50 2020 UTC

replace unprintable characters with '.' before passing them to curses

Otherwise, ncurses will replace them with some printable representation
whose width we can't predict, and wunctrl() fails to return the
replacement for 0x80..0x9f.

ok stsp

commit - f5a09613ce18eb49de0d07d7f7a1dbd5dcac25c8
commit + 748d5cab9a3d0d5d0edc28c8fd38430c684b1e55
blob - ca7f33b17ed856f59a4e0fc0cd5d1339a9ed6d93
blob + 8306375617fb59493e4cb3afb9648ec208873a0c
--- tog/tog.c
+++ tog/tog.c
@@ -1190,10 +1190,13 @@ format_line(wchar_t **wlinep, int *widthp, const char 
 			if (wline[i] == L'\t') {
 				width = TABSIZE -
 				    ((cols + col_tab_align) % TABSIZE);
-				if (cols + width > wlimit)
-					break;
-				cols += width;
+			} else {
+				width = 1;
+				wline[i] = L'.';
 			}
+			if (cols + width > wlimit)
+				break;
+			cols += width;
 			i++;
 		} else {
 			err = got_error_from_errno("wcwidth");