fix(messages): typo and unwanted truncation in msg_outtrans_long #31669

- Typo/bug in msg_outtrans_long passing string length as "hist" argument.
- Avoid truncating message in msg_outtrans_long with ext_messages (followup to 
  1097d239c3).
- Remove `_hl` from `msg_keep`, `smsg_keep` as there is no non-`_hl` variant.
- `msg_printf_hl` is removed (identical to `smsg` except it sets
  `msg_scroll = true`, seemingly as a caveat to force a more prompt in
  cmdline mode). Move this logic to the only the only place this was
  used in ex_getln.c.

src/nvim/ex_getln.c

@@ -3142,8 +3142,9 @@ static bool color_cmdline(CmdlineInfo *colored_ccline)
 
 #define PRINT_ERRMSG(...) \
   do { \
+    msg_scroll = true; \
     msg_putchar('\n'); \
-    msg_printf_hl(HLF_E, __VA_ARGS__); \
+    smsg(HLF_E, __VA_ARGS__); \
     printed_errmsg = true; \
   } while (0)
   bool ret = true;

src/nvim/message.c

@@ -130,7 +130,7 @@ bool keep_msg_more = false;    // keep_msg was set by msgmore()
 // msg_scrolled     How many lines the screen has been scrolled (because of
 //                  messages).  Used in update_screen() to scroll the screen
 //                  back.  Incremented each time the screen scrolls a line.
-// msg_scrolled_ign  true when msg_scrolled is non-zero and msg_puts_hl_id()
+// msg_scrolled_ign  true when msg_scrolled is non-zero and msg_puts_hl()
 //                  writes something without scrolling should not make
 //                  need_wait_return to be set.  This is a hack to make ":ts"
 //                  work without an extra prompt.
@@ -244,7 +244,7 @@ void msg_grid_validate(void)
 int verb_msg(const char *s)
 {
   verbose_enter();
-  int n = msg_hl_keep(s, 0, false, false);
+  int n = msg_keep(s, 0, false, false);
   verbose_leave();
 
   return n;
@@ -257,7 +257,7 @@ int verb_msg(const char *s)
 bool msg(const char *s, const int hl_id)
   FUNC_ATTR_NONNULL_ARG(1)
 {
-  return msg_hl_keep(s, hl_id, false, false);
+  return msg_keep(s, hl_id, false, false);
 }
 
 /// Similar to msg_outtrans_len, but support newlines and tabs.
@@ -309,7 +309,7 @@ void msg_multihl(HlMessage hl_msg, const char *kind, bool history)
 }
 
 /// @param keep set keep_msg if it doesn't scroll
-bool msg_hl_keep(const char *s, int hl_id, bool keep, bool multiline)
+bool msg_keep(const char *s, int hl_id, bool keep, bool multiline)
   FUNC_ATTR_NONNULL_ALL
 {
   static int entered = 0;
@@ -514,7 +514,7 @@ int smsg(int hl_id, const char *s, ...)
   return msg(IObuff, hl_id);
 }
 
-int smsg_hl_keep(int hl_id, const char *s, ...)
+int smsg_keep(int hl_id, const char *s, ...)
   FUNC_ATTR_PRINTF(2, 3)
 {
   va_list arglist;
@@ -522,7 +522,7 @@ int smsg_hl_keep(int hl_id, const char *s, ...)
   va_start(arglist, s);
   vim_vsnprintf(IObuff, IOSIZE, s, arglist);
   va_end(arglist);
-  return msg_hl_keep(IObuff, hl_id, true, false);
+  return msg_keep(IObuff, hl_id, true, false);
 }
 
 // Remember the last sourcing name/lnum used in an error message, so that it
@@ -767,7 +767,7 @@ bool emsg_multiline(const char *s, bool multiline)
 
   // Display the error message itself.
   msg_nowait = false;  // Wait for this msg.
-  return msg_hl_keep(s, hl_id, false, multiline);
+  return msg_keep(s, hl_id, false, multiline);
 }
 
 /// emsg() - display an error message
@@ -1193,7 +1193,7 @@ void ex_messages(exarg_T *eap)
       if (kv_size(p->multihl)) {
         msg_multihl(p->multihl, p->kind, false);
       } else if (p->msg != NULL) {
-        msg_hl_keep(p->msg, p->hl_id, false, p->multiline);
+        msg_keep(p->msg, p->hl_id, false, p->multiline);
       }
     }
     msg_hist_off = false;
@@ -2103,12 +2103,12 @@ void msg_outtrans_long(const char *longstr, int hl_id)
   int len = (int)strlen(longstr);
   int slen = len;
   int room = Columns - msg_col;
-  if (len > room && room >= 20) {
+  if (!ui_has(kUIMessages) && len > room && room >= 20) {
     slen = (room - 3) / 2;
     msg_outtrans_len(longstr, slen, hl_id, false);
     msg_puts_hl("...", HLF_8, false);
   }
-  msg_outtrans_len(longstr + len - slen, slen, hl_id, len);
+  msg_outtrans_len(longstr + len - slen, slen, hl_id, false);
 }
 
 /// Basic function for writing a message with highlight id.
@@ -2178,27 +2178,6 @@ void msg_puts_len(const char *const str, const ptrdiff_t len, int hl_id, bool hi
   need_fileinfo = false;
 }
 
-/// Print a formatted message
-///
-/// Message printed is limited by #IOSIZE. Must not be used from inside
-/// msg_puts_hl_id().
-///
-/// @param[in]  hl_id  Highlight id.
-/// @param[in]  fmt  Format string.
-void msg_printf_hl(const int hl_id, const char *const fmt, ...)
-  FUNC_ATTR_NONNULL_ARG(2) FUNC_ATTR_PRINTF(2, 3)
-{
-  static char msgbuf[IOSIZE];
-
-  va_list ap;
-  va_start(ap, fmt);
-  const size_t len = (size_t)vim_vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
-  va_end(ap);
-
-  msg_scroll = true;
-  msg_puts_len(msgbuf, (ptrdiff_t)len, hl_id, true);
-}
-
 static void msg_ext_emit_chunk(void)
 {
   if (msg_ext_chunks == NULL) {

src/nvim/ops.c

@@ -258,7 +258,7 @@ void op_shift(oparg_T *oap, bool curs_top, int amount)
     vim_snprintf(IObuff, IOSIZE,
                  NGETTEXT(msg_line_single, msg_line_plural, oap->line_count),
                  (int64_t)oap->line_count, op, amount);
-    msg_hl_keep(IObuff, 0, true, false);
+    msg_keep(IObuff, 0, true, false);
   }
 
   if ((cmdmod.cmod_flags & CMOD_LOCKMARKS) == 0) {

src/nvim/quickfix.c

@@ -2937,7 +2937,7 @@ static void qf_jump_print_msg(qf_info_T *qi, int qf_index, qfline_T *qf_ptr, buf
     msg_scroll = false;
   }
   msg_ext_set_kind("quickfix");
-  msg_hl_keep(gap->ga_data, 0, true, false);
+  msg_keep(gap->ga_data, 0, true, false);
   msg_scroll = (int)i;
 
   qfga_clear();

src/nvim/undo.c

@@ -2596,12 +2596,12 @@ static void u_undo_end(bool did_undo, bool absolute, bool quiet)
     check_pos(curbuf, &VIsual);
   }
 
-  smsg_hl_keep(0, _("%" PRId64 " %s; %s #%" PRId64 "  %s"),
-               u_oldcount < 0 ? (int64_t)-u_oldcount : (int64_t)u_oldcount,
-               _(msgstr),
-               did_undo ? _("before") : _("after"),
-               uhp == NULL ? 0 : (int64_t)uhp->uh_seq,
-               msgbuf);
+  smsg_keep(0, _("%" PRId64 " %s; %s #%" PRId64 "  %s"),
+            u_oldcount < 0 ? (int64_t)-u_oldcount : (int64_t)u_oldcount,
+            _(msgstr),
+            did_undo ? _("before") : _("after"),
+            uhp == NULL ? 0 : (int64_t)uhp->uh_seq,
+            msgbuf);
 }
 
 /// Put the timestamp of an undo header in "buf[buflen]" in a nice format.