lexicon_filter fix for escaped options

Fixes #1703. Also fixes short and long options markup in synopsis when
directly following a '(' or '[' character.

doc_src/bind.txt

@@ -120,6 +120,6 @@ Performs a history search when the @key{Page Up} key is pressed.
 
 \fish
 set -g fish_key_bindings fish_vi_key_bindings
-bind -M insert @args{@bksl{cc}} kill-whole-line force-repaint
+bind -M insert \cc kill-whole-line force-repaint
 \endfish
 Turns on Vi key bindings and rebinds @key{Control,C} to clear the input line.

lexicon_filter.in

@@ -188,14 +188,14 @@ s/@sgst{\([^}]*\)}/\\\
 #.
 # Command/Function options
 # Short options
-s/ -\([A-Za-z][A-Za-z]*\)\([^A-Za-z}]\)/ \\\
+s/\([[( ]\)-\([A-Za-z][A-Za-z]*\)\([^A-Za-z}]\)/\1\\\
-<@opts{-\1}\
+<@opts{-\2}\
-\2/g
+\3/g
 #.
 # Long options
-s/ --\([A-Za-z][A-Za-z0-9=_-]*\)\([^A-Za-z0-9=_-]*\)/ \\\
+s/\([[( ]\)--\([A-Za-z][A-Za-z0-9=_-]*\)\([^A-Za-z0-9=_-]*\)/\1\\\
-<@opts{--\1}\
+<@opts{--\2}\
-\2/g
+\3/g
 #.
 # Prompt
 s/~>_/\\\
@@ -211,6 +211,9 @@ s/___\(.\)/\\\
 <@curs{\1}\
 /
 #.
+# Escaped Options
+s/ \\\([A-Za-z0-9][A-Za-z0-9]*\) / @bksl{\1} /g
+#.
 # Trailing Backslash
 s/ \\$/ @bksl{ }/
 #.
@@ -447,7 +450,10 @@ s/\( *@redr{|} *\)@bltn/\1@xbln/g
 s/^\( *\)@func/\1@xfnc/
 s/\( *[;()] *\)@func/\1@xfnc/g
 s/\( *@redr{|} *\)@func/\1@xfnc/g
-s/\\@bltn{\([^}]*\)/@args{@bksl{\1}/g
+s/ @bksl{\([^}]*\)} / @args{@bksl{\1}} /g
+s/ @bksl{@bltn{\([^}]*\)}/ @args{@bksl{\1}/g
+s/ @bksl{@func{\([^}]*\)}/ @args{@bksl{\1}/g
+s/ @bksl{@cmnd{\([^}]*\)}/ @args{@bksl{\1}/g
 s/@bltn/@args/g
 s/@func/@args/g
 s/@cmnd/@args/g