From cc274ebdf4417f13a7197efcfb72aa34bea32733 Mon Sep 17 00:00:00 2001
From: Nils Adermann <naderman@naderman.de>
Date: Thu, 7 Nov 2019 17:42:17 +0100
Subject: [PATCH] Do not reset references on update mirrors if VCS type has
 changed

---
 src/Composer/DependencyResolver/LockTransaction.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Composer/DependencyResolver/LockTransaction.php b/src/Composer/DependencyResolver/LockTransaction.php
index 7255de3dd..293f4a43b 100644
--- a/src/Composer/DependencyResolver/LockTransaction.php
+++ b/src/Composer/DependencyResolver/LockTransaction.php
@@ -158,9 +158,14 @@ class LockTransaction
         foreach ($this->resultPackages[$devMode ? 'dev' : 'non-dev'] as $package) {
             if (!($package instanceof AliasPackage) && !($package instanceof RootAliasPackage)) {
                 // if we're just updating mirrors we need to reset references to the same as currently "present" packages' references to keep the lock file as-is
+                // we do not reset references if the currently present package didn't have any, or if the type of VCS has changed
                 if ($updateMirrors && !isset($this->presentMap[spl_object_hash($package)])) {
                     foreach ($this->presentMap as $presentPackage) {
-                        if ($package->getName() == $presentPackage->getName() && $package->getVersion() == $presentPackage->getVersion() && $presentPackage->getSourceReference()) {
+                        if ($package->getName() == $presentPackage->getName() &&
+                            $package->getVersion() == $presentPackage->getVersion() &&
+                            $presentPackage->getSourceReference() &&
+                            $presentPackage->getSourceType() === $package->getSourceType()
+                        ) {
                             $package->setSourceDistReferences($presentPackage->getSourceReference());
                         }
                     }