From 8da3b3b9be116f9d3084438d5b33e58acd801240 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Wed, 24 Feb 2021 16:36:09 +0100
Subject: [PATCH] List relevant conflicts in why/why-not, fixes #9693

---
 src/Composer/Repository/InstalledRepository.php | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/Composer/Repository/InstalledRepository.php b/src/Composer/Repository/InstalledRepository.php
index d7ffe92d1..7405a30bb 100644
--- a/src/Composer/Repository/InstalledRepository.php
+++ b/src/Composer/Repository/InstalledRepository.php
@@ -165,6 +165,18 @@ class InstalledRepository extends CompositeRepository
                 }
             }
 
+            // List conflicts against X as they may explain why the current version was selected, or explain why it is rejected if the conflict matched when inverting
+            foreach ($package->getConflicts() as $link) {
+                if (in_array($link->getTarget(), $needles)) {
+                    foreach ($this->findPackages($link->getTarget()) as $pkg) {
+                        $version = new Constraint('=', $pkg->getVersion());
+                        if ($link->getConstraint()->matches($version) === $invert) {
+                            $results[] = array($package, $link, false);
+                        }
+                    }
+                }
+            }
+
             // When inverting, we need to check for conflicts of the needles' requirements against installed packages
             if ($invert && $constraint && in_array($package->getName(), $needles) && $constraint->matches(new Constraint('=', $package->getVersion()))) {
                 foreach ($package->getRequires() as $link) {