patch 9.0.0948: 'ttyfast' is set for arbitrary terminals

Problem:    'ttyfast' is set for arbitrary terminals.
Solution:   Always set 'ttyfast'. (closes #11549)

runtime/doc/options.txt

@@ -8569,10 +8569,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 	xterm entries...).
 
 				     *'ttyfast'* *'tf'* *'nottyfast'* *'notf'*
-'ttyfast' 'tf'		boolean	(default off, on when 'term' is xterm, hpterm,
-					sun-cmd, screen, rxvt, dtterm or
-					iris-ansi; also on when running Vim in
-					a DOS console)
+'ttyfast' 'tf'		boolean	(default on)
 			global
 	Indicates a fast terminal connection.  More characters will be sent to
 	the screen for redrawing, instead of using insert/delete line
@@ -8582,6 +8579,14 @@ A jump table for the options with a short description can be found at |Q_op|.
 	line for lines that wrap.  This helps when using copy/paste with the
 	mouse in an xterm and other terminals.
 
+	The default used to be set only for some terminal names, but these
+	days nearly all terminals are fast, therefore the default is now "on".
+	If you have a slow connection you may want to set this option off,
+	e.g. depending on the host name: >
+		if hostname() =~ 'faraway'
+		   set nottyfast
+		endif
+<
 						*'ttymouse'* *'ttym'*
 'ttymouse' 'ttym'	string	(default depends on 'term')
 			global

runtime/doc/os_unix.txt

@@ -28,10 +28,11 @@ system() is used, which is a bit slower.  The output of ":version" includes
 can be changed at compile time.
 (For forking of the GUI version see |gui-fork|.)
 
-Because terminal updating under Unix is often slow (e.g. serial line
-terminal, shell window in suntools), the 'showcmd' and 'ruler' options
-are off by default.  If you have a fast terminal, try setting them on.  You
-might also want to set 'ttyfast'.
+For historic reasons terminal updating under Unix is expected to be slow (e.g.
+serial line terminal, shell window in suntools), the 'showcmd' and 'ruler'
+options are off by default.  If you have a fast terminal, try setting them
+on: >
+	set showcmd ruler
 
 When using Vim in an xterm the mouse clicks can be used by Vim by setting
 'mouse' to "a".  If there is access to an X-server gui style copy/paste will

runtime/doc/os_vms.txt

@@ -458,18 +458,11 @@ Ins, Del buttons etc., except Backspace in GUI mode.  To solve it, add to
 
 Vim will also recognize that they are fast terminals.
 
-If you have some annoying line jumping on the screen between windows add to
-your .vimrc file: >
-
-	set ttyfast	" set fast terminal
-
-Note: if you're using Vim on remote host or through a very slow connection, it's
-recommended to avoid the fast terminal option with: >
+If you're using Vim on remote host or through a very slow connection, you
+might want to reset fast terminal option with: >
 
 	set nottyfast   " set terminal to slow mode
 
-(Zoltan Arpadffy, Vim 5.6)
-
 
 8.7 Hex-editing and other external tools
 

runtime/doc/term.txt

@@ -768,8 +768,9 @@ See the "Options" chapter |options|.
 
 If your terminal does not support a scrolling region, but it does support
 insert/delete line commands, scrolling with multiple windows may make the
-lines jump up and down.  If you don't want this set the 'ttyfast' option.
-This will redraw the window instead of scroll it.
+lines jump up and down.  This would happen if the 'ttyfast' option has been
+reset.  Check that with: >
+	verbose set ttyfast?
 
 If your terminal scrolls very slowly, but redrawing is not slow, set the
 'ttyscroll' option to a small number, e.g., 3.  This will make Vim redraw the

src/optiondefs.h

@@ -2599,7 +2599,7 @@ static struct vimoption options[] =
 			    {(char_u *)TRUE, (char_u *)0L} SCTX_INIT},
     {"ttyfast",	    "tf",   P_BOOL|P_NO_MKRC|P_VI_DEF,
 			    (char_u *)&p_tf, PV_NONE,
-			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
+			    {(char_u *)TRUE, (char_u *)0L} SCTX_INIT},
     {"ttymouse",    "ttym", P_STRING|P_NODEFAULT|P_NO_MKRC|P_VI_DEF,
 #if defined(UNIX) || defined(VMS)
 			    (char_u *)&p_ttym, PV_NONE,

src/os_unix.c

@@ -2437,24 +2437,6 @@ vim_is_vt300(char_u *name)
 	    || STRCMP(name, "builtin_vt320") == 0);
 }
 
-/*
- * Return TRUE if "name" is a terminal for which 'ttyfast' should be set.
- * This should include all windowed terminal emulators.
- */
-    int
-vim_is_fastterm(char_u *name)
-{
-    if (name == NULL)
-	return FALSE;
-    if (vim_is_xterm(name) || vim_is_vt300(name) || vim_is_iris(name))
-	return TRUE;
-    return (   STRNICMP(name, "hpterm", 6) == 0
-	    || STRNICMP(name, "sun-cmd", 7) == 0
-	    || STRNICMP(name, "screen", 6) == 0
-	    || STRNICMP(name, "tmux", 4) == 0
-	    || STRNICMP(name, "dtterm", 6) == 0);
-}
-
 /*
  * Insert user name in s[len].
  * Return OK if a name found.

src/proto/os_unix.pro

@@ -23,7 +23,6 @@ int use_xterm_like_mouse(char_u *name);
 int use_xterm_mouse(void);
 int vim_is_iris(char_u *name);
 int vim_is_vt300(char_u *name);
-int vim_is_fastterm(char_u *name);
 int mch_get_user_name(char_u *s, int len);
 int mch_get_uname(uid_t uid, char_u *s, int len);
 void mch_get_host_name(char_u *s, int len);

src/term.c

@@ -2174,21 +2174,6 @@ set_termname(char_u *term)
     }
 #endif
 
-#if defined(UNIX) || defined(VMS)
-    /*
-     * 'ttyfast' is default on for xterm, iris-ansi and a few others.
-     */
-    if (vim_is_fastterm(term))
-	p_tf = TRUE;
-#endif
-#ifdef USE_TERM_CONSOLE
-    /*
-     * 'ttyfast' is default on consoles
-     */
-    if (term_console)
-	p_tf = TRUE;
-#endif
-
     ttest(TRUE);	// make sure we have a valid set of terminal codes
 
     full_screen = TRUE;		// we can use termcap codes from now on

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    948,
 /**/
     947,
 /**/