Fixed fish_prompt not displaying $status

The virtualenv `fish_prompt` wrapper now ensures that the original `fish_prompt` correctly displays the `$status` of the last command.

Author: Lucretiel

virtualenv_embedded/activate.fish

@@ -50,14 +50,19 @@ if test \( -z $VIRTUAL_ENV_DISABLE_PROMPT \)
     functions -c fish_prompt _old_fish_prompt
 
     function fish_prompt
+        # Save the current $status, for fish_prompts that display it.
+        set -l old_status $status
+
         # Prompt override provided?
         # If not, just prepend the environment name.
         if test -n "__VIRTUAL_PROMPT__"
             printf '%s%s' "__VIRTUAL_PROMPT__" (set_color normal)
         else
             printf '%svirtualenv:%s %s%s%s\n' (set_color white) (set_color normal) (set_color -b black white) (basename $VIRTUAL_ENV) (set_color normal)
         end
-
+        
+        # Restore the original $status
+        source "exit $old_status" | source
         _old_fish_prompt
     end