Environment markers are not applied evenly

[Sclafus]

Environment Versions

1. OS Type: Windows 10
2. Python version: Python 3.10.7
3. pip version: pip 22.3.1
4. pip-tools version: pip-compile 6.11.0

Steps to replicate

1. Write a requirements.in file with the following content

wmi ; sys_platform=='win32'

2. pip-compile

Expected result

#
# This file is autogenerated by pip-compile with Python 3.10
# by the following command:
#
#    pip-compile
#
pywin32==305 ; sys_platform == "win32"
    # via wmi
wmi==1.5.1 ; sys_platform == "win32"
    # via -r requirements.in

Note that both pywin32 and wmi are installed on win32 platforms. This is the expected result since pywin32 is installed by wmi and is required only by that package, which has the environment marker for win32 systems.

Actual result

#
# This file is autogenerated by pip-compile with Python 3.10
# by the following command:
#
#    pip-compile
#
pywin32==305
    # via wmi
wmi==1.5.1 ; sys_platform == "win32"
    # via -r requirements.in

Is this intended? Am I missing some edge cases?

[atugushev]

Duplicate of #563