Patch the new resolver to not uninstall from /usr/lib on updates

remove-existing-dist-only-if-path-conflicts.patch

@@ -10,12 +10,8 @@ Resolves: rhbz#1550368
 
 Co-Authored-By: Michal Cyprian <m.cyprian@gmail.com>
 Co-Authored-By: Victor Stinner <vstinner@redhat.com>
+Co-Authored-By: Petr Viktorin <pviktori@redhat.com>
 ---
- src/pip/_internal/req/req_install.py            |  3 ++-
- src/pip/_internal/resolution/legacy/resolver.py |  5 ++++-
- src/pip/_internal/utils/misc.py                 | 11 +++++++++++
- 3 files changed, 17 insertions(+), 2 deletions(-)
-
 diff --git a/src/pip/_internal/req/req_install.py b/src/pip/_internal/req/req_install.py
 index 4759f4a..2e76e35 100644
 --- a/src/pip/_internal/req/req_install.py
@@ -90,6 +86,33 @@ index 24a7455..5fd48d3 100644
  def dist_is_editable(dist):
      # type: (Distribution) -> bool
      """
+--- a/src/pip/_internal/resolution/resolvelib/factory.py
++++ b/src/pip/_internal/resolution/resolvelib/factory.py
+@@ -1,3 +1,4 @@
+ import logging
++import sys
+ 
+ from pip._vendor.packaging.utils import canonicalize_name
+@@ -17,5 +18,7 @@
+     dist_in_usersite,
+     get_installed_distributions,
++    dist_location,
+ )
++from pip._internal.locations import distutils_scheme
+ from pip._internal.utils.typing import MYPY_CHECK_RUNNING
+ from pip._internal.utils.virtualenv import running_under_virtualenv
+@@ -313,4 +316,11 @@
+             return None
+ 
++        # Prevent uninstalling packages from /usr
++        if dist_location(dist) in (
++                distutils_scheme('', prefix=sys.base_prefix)['purelib'],
++                distutils_scheme('', prefix=sys.base_prefix)['platlib'],
++            ):
++            return None
++
+         # We're installing into global site. The current installation must
+         # be uninstalled, no matter it's in global or user site, because the
 -- 
 2.25.4