terminate links with ST instead of BEL

See https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda.

  The sequence is terminated with ST (string terminator) which is
  typically ESC \. (Although ST is the standard sequence according to
  ECMA-48 §8.3.89, often the BEL (\a) character is used instead. This
  nonstandard choice originates from XTerm, and was later adopted by
  probably all terminal emulators to terminate OSC sequences. Nevertheless,
  we encourage the use of the standard ST.)

internal/p10k.zsh

@@ -1980,8 +1980,8 @@ prompt_dir() {
 
     local content="${(pj.$sep.)parts}"
     if (( _POWERLEVEL9K_DIR_HYPERLINK )); then
-      local header=$'%{\e]8;;file://'${${_p9k__cwd//\%/%%25}//'#'/%%23}$'\a%}'
-      local footer=$'%{\e]8;;\a%}'
+      local header=$'%{\e]8;;file://'${${_p9k__cwd//\%/%%25}//'#'/%%23}$'\e\\%}'
+      local footer=$'%{\e]8;;\e\\%}'
       if (( expand )); then
         _p9k_escape $header
         header=$_p9k__ret
@@ -5921,7 +5921,7 @@ function _p9k_clear_instant_prompt() {
           echo -E - "${(%):-    * Zsh will start %Bquickly%b but prompt will %Bjump down%b after initialization.}"
           echo -E - ""
           echo -E - "${(%):-For details, see:}"
-          echo    - "${(%):-\e]8;;https://github.com/romkatv/powerlevel10k/blob/master/README.md#instant-prompt\ahttps://github.com/romkatv/powerlevel10k/blob/master/README.md#instant-prompt\e]8;;\a}"
+          echo    - "${(%):-\e]8;;https://github.com/romkatv/powerlevel10k/blob/master/README.md#instant-prompt\e\\https://github.com/romkatv/powerlevel10k/blob/master/README.md#instant-prompt\e]8;;\e\\}"
           echo -E - ""
           echo    - "${(%):-%3F-- console output produced during zsh initialization follows --%f}"
           echo -E - ""
@@ -7840,7 +7840,7 @@ _p9k_init() {
     >&2 echo -E - "${(%):-You can:}"
     >&2 echo -E - ""
     >&2 echo -E - "${(%):-  - %BRecommended%b: Change the way Powerlevel10k is loaded from %B$__p9k_zshrc_u%b.}"
-    >&2 echo    - "${(%):-    See \e]8;;https://github.com/romkatv/powerlevel10k/blob/master/README.md#installation\ahttps://github.com/romkatv/powerlevel10k/blob/master/README.md#installation\e]8;;\a.}"
+    >&2 echo    - "${(%):-    See \e]8;;https://github.com/romkatv/powerlevel10k/blob/master/README.md#installation\e\\https://github.com/romkatv/powerlevel10k/blob/master/README.md#installation\e]8;;\e\\.}"
     if (( $+functins[zplugin] )); then
       >&2 echo -E - "${(%):-    NOTE: If using %2Fzplugin%f to load %3F'romkatv/powerlevel10k'%f, %Bdo not apply%b %1Fice wait%f.}"
     fi

internal/wizard.zsh

@@ -152,7 +152,8 @@ function print_prompt() {
 }
 
 function href() {
-  print -r -- $'%{\e]8;;'${1//\%/%%}$'\a%}'${1//\%/%%}$'%{\e]8;;\a%}'
+  local url=${${1//\%/%%}//\\/\\\\}
+  print -r -- '%{\e]8;;'$url'\e\\%}'$url'%{\e]8;;\e\\%}'
 }
 
 function flowing() {