hints kitten: When using the linenumber action with a background action, preserve the working directory

Fixes #3352

docs/changelog.rst

@@ -78,6 +78,9 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 - macOS: Disable the native operating system tabs as they are non-functional
   and can be confusing (:iss:`3325`)
 
+- hints kitten: When using the linenumber action with a background action,
+  preserve the working directory (:iss:`3352`)
+
 
 0.19.3 [2020-12-19]
 -------------------

kittens/hints/main.py

@@ -698,7 +698,7 @@ def linenum_handle_result(args: List[str], data: Dict[str, Any], target_window_i
             w.paste_bytes(text + '\r')
     elif action == 'background':
         import subprocess
-        subprocess.Popen(cmd)
+        subprocess.Popen(cmd, cwd=data['cwd'])
     else:
         getattr(boss, {
             'window': 'new_window_with_cwd', 'tab': 'new_tab_with_cwd', 'os_window': 'new_os_window_with_cwd'