Remove 'ttyfast'

refs #1045 #1051

This was enabled by default a while ago (#1051), and has apparently not
created any issues.  The amount of actual code related to it is tiny, so
it has been removed.

5 files changed, 6 insertions, 22 deletions

diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 082ce25671..bb26b38af9 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -7353,16 +7353,7 @@ 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 on)
-			global
-			{not in Vi}
-	Indicates a fast terminal connection.  More characters will be sent to
-	the screen for redrawing, instead of using insert/delete line
-	commands.  Improves smoothness of redrawing when there are multiple
-	windows and the terminal does not support a scrolling region.
-	Also enables the extra writing of characters at the end of each screen
-	line for lines that wrap.  This helps when using copy/paste with the
-	mouse in an xterm and other terminals.
+'ttyfast' 'tf'		Removed. {Nvim}
 
 						*'ttymouse'* *'ttym'*
 'ttymouse' 'ttym'	string	(default depends on 'term')
diff --git a/runtime/doc/os_unix.txt b/runtime/doc/os_unix.txt
index 49f19c6661..73e955e834 100644
--- a/runtime/doc/os_unix.txt
+++ b/runtime/doc/os_unix.txt
@@ -30,8 +30,7 @@ can be changed at compile time.
 
 Because terminal updating under Unix is often slow (e.g. serial line
 terminal, shell window in suntools), the 'showcmd' and 'ruler' options
-are default off.  If you have a fast terminal, try setting them on.  You might
-also want to set 'ttyfast'.
+are off by default.
 
 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
diff --git a/runtime/doc/quickref.txt b/runtime/doc/quickref.txt
index 6debcbe112..3b3214456b 100644
--- a/runtime/doc/quickref.txt
+++ b/runtime/doc/quickref.txt
@@ -911,7 +911,6 @@ Short explanation of each option:		*option-list*
 'ttimeout'		    time out on mappings
 'ttimeoutlen'	  'ttm'     time out time for key codes in milliseconds
 'ttybuiltin'	  'tbi'     use built-in termcap before external termcap
-'ttyfast'	  'tf'	    indicates a fast terminal connection
 'ttymouse'	  'ttym'    type of mouse codes generated
 'ttyscroll'	  'tsl'     maximum number of lines for a scroll
 'ttytype'	  'tty'     alias for 'term'
diff --git a/runtime/doc/starting.txt b/runtime/doc/starting.txt
index de25a7ea25..39cb522002 100644
--- a/runtime/doc/starting.txt
+++ b/runtime/doc/starting.txt
@@ -984,10 +984,10 @@ vimrc file.
 These commands will write ":map" and ":set" commands to a file, in such a way
 that when these commands are executed, the current key mappings and options
 will be set to the same values.  The options 'columns', 'endofline',
-'fileformat', 'lines', 'modified', 'scroll', 'term', 'ttyfast' and 'ttymouse'
-are not included, because these are terminal or file dependent.  Note that the
-options 'binary', 'paste' and 'readonly' are included, this might not always
-be what you want.
+'fileformat', 'lines', 'modified', 'scroll', 'term', and 'ttymouse' are not
+included, because these are terminal or file dependent.  Note that the options
+'binary', 'paste' and 'readonly' are included, this might not always be what
+you want.
 
 When special keys are used in mappings, The 'cpoptions' option will be
 temporarily set to its Vim default, to avoid the mappings to be
diff --git a/runtime/doc/term.txt b/runtime/doc/term.txt
index ea272031d6..49eb429319 100644
--- a/runtime/doc/term.txt
+++ b/runtime/doc/term.txt
@@ -537,11 +537,6 @@ If the characters from the terminal are arriving with more than 1 second
 between them you might want to set the 'timeout' and/or 'ttimeout' option.
 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.
-
 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
 screen instead of scrolling, when there are more than 3 lines to be scrolled.