bug#64535: 30.0.50; Spurious newlines in `prin1` output

[Stefan Monnier]

Package: Emacs
Version: 30.0.50


`prin1` never inserts newlines unless they're within strings (and that
can be controlled with `print-escape-newlines`), right?  Right?

Nope: it does insert newlines inside char-table when reaching the 3rd
level of subtables.  This was done to work around the long lines problem
in redisplay (bug#2866), but it's far from the only case where `prin1`
can emit a long line, and we've significantly improved our handling of
long lines.

Can we get rid of this quirk now, please?


        Stefan


diff --git a/src/print.c b/src/print.c
index 5c95aeb9a20..aae998692fb 100644
--- a/src/print.c
+++ b/src/print.c
@@ -2544,11 +2544,6 @@ print_object (Lisp_Object obj, Lisp_Object printcharfun, 
bool escapeflag)
          }
        case PVEC_SUB_CHAR_TABLE:
          {
-           /* Make each lowest sub_char_table start a new line.
-              Otherwise we'll make a line extremely long, which
-              results in slow redisplay.  */
-           if (XSUB_CHAR_TABLE (obj)->depth == 3)
-             printchar ('\n', printcharfun);
            print_c_string ("#^^[", printcharfun);
            int n = sprintf (buf, "%d %d",
                             XSUB_CHAR_TABLE (obj)->depth,