Issue 12: Highlight isearch like fish

Bind highlighting to more history navigation ZLE events

zsh-syntax-highlighting.zsh

@@ -9,6 +9,8 @@
 typeset -A ZSH_SYNTAX_HIGHLIGHTING_STYLES
 ZSH_SYNTAX_HIGHLIGHTING_STYLES=(
   default                       'none'
+  isearch                       'fg=magenta,standout'
+  special                       'fg=magenta,standout'
   unknown-token                 'fg=red,bold'
   reserved-word                 'fg=yellow,bold'
   alias                         'fg=green,bold'
@@ -44,25 +46,64 @@ ZSH_HIGHLIGHT_TOKENS_FOLLOWED_BY_COMMANDS=(
 
 # ZLE events that trigger an update of the highlighting.
 ZSH_HIGHLIGHT_ZLE_UPDATE_EVENTS=(
-  self-insert
-  magic-space
-  delete-char
-  delete-char-or-list
+  accept-and-hold
+  accept-and-infer-next-history
+  accept-line
+  accept-line-and-down-history
   backward-delete-char
-  kill-word
+  backward-delete-word
   backward-kill-word
-  up-line-or-history
-  down-line-or-history
+  beginning-of-buffer-or-history
   beginning-of-history
-  end-of-history
-  accept-line
-  accept-line-and-down-history
-  undo
-  redo
-  yank
+  beginning-of-history
+  beginning-of-line-hist
   complete-word
+  delete-char
+  delete-char-or-list
+  down-history
+  down-line-or-history
+  down-line-or-history
+  down-line-or-search
+  end-of-buffer-or-history
+  end-of-history
+  end-of-line-hist
   expand-or-complete
   expand-or-complete-prefix
+  history-beginning-search-backward
+  history-beginning-search-forward
+  history-incremental-search-backward
+  history-incremental-search-forward
+  history-search-backward
+  history-search-forward
+  infer-next-history
+  insert-last-word
+  kill-word
+  magic-space
+  quoted-insert
+  redo
+  self-insert
+  undo
+  up-history
+  up-line-or-history
+  up-line-or-history
+  up-line-or-search
+  up-line-or-search
+  vi-backward-kill-word
+  vi-down-line-or-history
+  vi-fetch-history
+  vi-history-search-backward
+  vi-history-search-forward
+  vi-quoted-insert
+  vi-repeat-search
+  vi-rev-repeat-search
+  vi-up-line-or-history
+  yank
+)
+
+# ZLE highlight types.
+zle_highlight=(
+  special:$ZSH_SYNTAX_HIGHLIGHTING_STYLES[special]
+  isearch:$ZSH_SYNTAX_HIGHLIGHTING_STYLES[isearch]
 )
 
 # Check if the argument is a path.