Port #3263 with updates

- Allow click's editor to inherit the environment from the subprocess.
- Fixes #2747
- Supersedes, replaces, and closes #3263

Signed-off-by: Dan Ryan <dan@danryan.co>

pipenv/cli/command.py

@@ -553,7 +553,7 @@ def run_open(state, module, *args, **kwargs):
 
         EDITOR=atom pipenv open requests
     """
-    from ..core import which, ensure_project
+    from ..core import which, ensure_project, inline_activate_virtual_environment
 
     # Ensure that virtualenv is available.
     ensure_project(
@@ -573,9 +573,7 @@ def run_open(state, module, *args, **kwargs):
     else:
         p = c.out.strip().rstrip("cdo")
     echo(crayons.normal("Opening {0!r} in your EDITOR.".format(p), bold=True))
-    from ..core import inline_activate_virtual_environment
     inline_activate_virtual_environment()
-    environment={"VIRTUAL_ENV":os.environ["VIRTUAL_ENV"]}
     edit(filename=p)
     return 0