patch 8.0.1277: terminal window CR-NL conversions may cause problems

Problem:    Terminal window CR-NL conversions may cause problems.
Solution:   Avoid most conversions, only fetch the current backspace key value
            from the tty. (mostly by Ozaki Kiichi, closes #2278)

src/terminal.c

@@ -181,11 +181,9 @@ static int create_pty_only(term_T *term, jobopt_T *opt);
 static void term_report_winsize(term_T *term, int rows, int cols);
 static void term_free_vterm(term_T *term);
 
-/* The characters that we know (or assume) that the terminal expects for the
+/* The character that we know (or assume) that the terminal expects for the
- * backspace and enter keys. */
+ * backspace key. */
 static int term_backspace_char = BS;
-static int term_enter_char = CAR;
-static int term_nl_does_cr = FALSE;
 
 
 /**************************************
@@ -651,30 +649,8 @@ free_terminal(buf_T *buf)
 term_write_job_output(term_T *term, char_u *msg, size_t len)
 {
     VTerm	*vterm = term->tl_vterm;
-    char_u	*p;
-    size_t	done;
-    size_t	len_now;
 
-    if (term_nl_does_cr)
+    vterm_input_write(vterm, (char *)msg, len);
-	vterm_input_write(vterm, (char *)msg, len);
-    else
-	/* need to convert NL to CR-NL */
-	for (done = 0; done < len; done += len_now)
-	{
-	    for (p = msg + done; p < msg + len; )
-	    {
-		if (*p == NL)
-		    break;
-		p += utf_ptr2len_len(p, (int)(len - (p - msg)));
-	    }
-	    len_now = p - msg - done;
-	    vterm_input_write(vterm, (char *)msg + done, len_now);
-	    if (p < msg + len && *p == NL)
-	    {
-		vterm_input_write(vterm, "\r\n", 2);
-		++len_now;
-	    }
-	}
 
     /* this invokes the damage callbacks */
     vterm_screen_flush_damage(vterm_obtain_screen(vterm));
@@ -760,7 +736,8 @@ term_convert_key(term_T *term, int c, char *buf)
 
     switch (c)
     {
-	case CAR:		c = term_enter_char; break;
+	/* don't use VTERM_KEY_ENTER, it may do an unwanted conversion */
+
 				/* don't use VTERM_KEY_BACKSPACE, it always
 				 * becomes 0x7f DEL */
 	case K_BS:		c = term_backspace_char; break;
@@ -1534,7 +1511,8 @@ terminal_loop(int blocking)
     int		termkey = 0;
     int		ret;
 #ifdef UNIX
-    int		tty_fd = curbuf->b_term->tl_job->jv_channel->ch_part[get_tty_part(curbuf->b_term)].ch_fd;
+    int		tty_fd = curbuf->b_term->tl_job->jv_channel
+				 ->ch_part[get_tty_part(curbuf->b_term)].ch_fd;
 #endif
 
     /* Remember the terminal we are sending keys to.  However, the terminal
@@ -1557,30 +1535,11 @@ terminal_loop(int blocking)
 		break;
 	update_cursor(curbuf->b_term, FALSE);
 
-#ifdef UNIX
-	/*
-	 * The shell or another program may change the tty settings.  Getting
-	 * them for every typed character is a bit of overhead, but it's needed
-	 * for the first CR typed, e.g. when Vim starts in a shell.
-	 */
-	if (isatty(tty_fd))
-	{
-	    ttyinfo_T info;
-
-	    /* Get the current backspace and enter characters of the pty. */
-	    if (get_tty_info(tty_fd, &info) == OK)
-	    {
-		term_backspace_char = info.backspace;
-		term_enter_char = info.enter;
-		term_nl_does_cr = info.nl_does_cr;
-	    }
-	}
-#endif
-
 	c = term_vgetc();
 	if (!term_use_loop())
 	{
-	    /* job finished while waiting for a character */
+	    /* Job finished while waiting for a character.  Push back the
+	     * received character. */
 	    if (c != K_IGNORE)
 		vungetc(c);
 	    break;
@@ -1588,6 +1547,22 @@ terminal_loop(int blocking)
 	if (c == K_IGNORE)
 	    continue;
 
+#ifdef UNIX
+	/*
+	 * The shell or another program may change the tty settings.  Getting
+	 * them for every typed character is a bit of overhead, but it's needed
+	 * for the first character typed, e.g. when Vim starts in a shell.
+	 */
+	if (isatty(tty_fd))
+	{
+	    ttyinfo_T info;
+
+	    /* Get the current backspace character of the pty. */
+	    if (get_tty_info(tty_fd, &info) == OK)
+		term_backspace_char = info.backspace;
+	}
+#endif
+
 #ifdef WIN3264
 	/* On Windows winpty handles CTRL-C, don't send a CTRL_C_EVENT.
 	 * Use CTRL-BREAK to kill the job. */

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1277,
 /**/
     1276,
 /**/