docs: document the --indicator (-q) and 'set indicator' options

doc/nano.1

@@ -280,6 +280,11 @@ similar to a chroot.
 Preserve the XON and XOFF sequences (\fB^Q\fR and \fB^S\fR) so they
 will be caught by the terminal.
 .TP
+.BR \-q ", " \-\-indicator
+Display a "scrollbar" on the righthand side of the edit window.
+It shows the position of the viewport in the buffer
+and how much of the buffer is covered by the viewport.
+.TP
 .BR \-r\ \fInumber ", " \-\-fill= \fInumber
 Set the target width for justifying and automatic hard-wrapping at this
 \fInumber\fR of columns.  If the value is 0 or less, wrapping will occur

doc/nano.texi

@@ -392,6 +392,12 @@ similar to a chroot.
 Preserve the @kbd{^Q} (XON) and @kbd{^S} (XOFF) sequences so data being
 sent to the editor can be stopped and started.
 
+@item -q
+@itemx --indicator
+Display a "scrollbar" on the righthand side of the edit window.
+It shows the position of the viewport in the buffer
+and how much of the buffer is covered by the viewport.
+
 @item -r @var{number}
 @itemx --fill=@var{number}
 Set the target width for justifying and automatic hard-wrapping at this
@@ -881,6 +887,11 @@ The cursor position is remembered for the 200 most-recently edited files.
 @item set preserve
 Preserve the XON and XOFF keys (@kbd{^Q} and @kbd{^S}).
 
+@item set indicator
+Display a "scrollbar" on the righthand side of the edit window.
+It shows the position of the viewport in the buffer
+and how much of the buffer is covered by the viewport.
+
 @item set punct "@var{characters}"
 Set the characters treated as closing punctuation when justifying
 paragraphs.  This may not include blank characters.  Only the

doc/nanorc.5

@@ -147,6 +147,11 @@ text.  (The color of the stripe can be changed with \fBset stripecolor\fR.)
 Save the last hundred search strings and replacement strings and
 executed commands, so they can be easily reused in later sessions.
 .TP
+.B set indicator
+Display a "scrollbar" on the righthand side of the edit window.
+It shows the position of the viewport in the buffer
+and how much of the buffer is covered by the viewport.
+.TP
 .B set jumpyscrolling
 Scroll the buffer contents per half-screen instead of per line.
 .TP

doc/sample.nanorc.in

@@ -59,6 +59,9 @@
 ## Remember the used search/replace strings for the next session.
 # set historylog
 
+## Display a "scrollbar" on the righthand side of the edit window.
+# set indicator
+
 ## Scroll the buffer contents per half-screen instead of per line.
 # set jumpyscrolling
 

syntax/nanorc.nanorc

@@ -7,7 +7,7 @@ comment "#"
 color brightred ".*"
 
 # Keywords
-color brightgreen "^[[:space:]]*(set|unset)[[:space:]]+(afterends|allow_insecure_backup|atblanks|autoindent|backup|backwards|boldtext|breaklonglines|casesensitive|constantshow|cutfromcursor|emptyline|finalnewline|historylog|jumpyscrolling|linenumbers|locking|morespace|mouse|multibuffer|noconvert|nohelp|nopauses|nonewlines|nowrap|positionlog|preserve|quickblank|quiet|rawsequences|rebinddelete|regexp|saveonexit|showcursor|smarthome|smooth|softwrap|suspendable|tabstospaces|trimblanks|unix|view|wordbounds|zap)\>"
+color brightgreen "^[[:space:]]*(set|unset)[[:space:]]+(afterends|allow_insecure_backup|atblanks|autoindent|backup|backwards|boldtext|breaklonglines|casesensitive|constantshow|cutfromcursor|emptyline|finalnewline|historylog|indicator|jumpyscrolling|linenumbers|locking|morespace|mouse|multibuffer|noconvert|nohelp|nopauses|nonewlines|nowrap|positionlog|preserve|quickblank|quiet|rawsequences|rebinddelete|regexp|saveonexit|showcursor|smarthome|smooth|softwrap|suspendable|tabstospaces|trimblanks|unix|view|wordbounds|zap)\>"
 color yellow "^[[:space:]]*set[[:space:]]+((error|function|key|number|selected|status|stripe|title)color)[[:space:]]+(bright)?(white|black|red|blue|green|yellow|magenta|cyan|normal)?(,(white|black|red|blue|green|yellow|magenta|cyan|normal))?\>"
 color brightgreen "^[[:space:]]*set[[:space:]]+(backupdir|brackets|errorcolor|functioncolor|keycolor|matchbrackets|numbercolor|operatingdir|punct|quotestr|selectedcolor|speller|statuscolor|stripecolor|titlecolor|whitespace|wordchars)[[:space:]]+"
 color brightgreen "^[[:space:]]*set[[:space:]]+(fill[[:space:]]+-?[[:digit:]]+|(guidestripe|tabsize)[[:space:]]+[1-9][0-9]*)\>"