From e2f1e8aed6006dcdaa1fa7862a644a62ef87510c Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Thu, 25 Jun 2020 08:57:42 +0200
Subject: [PATCH] Allow optimizing fetching of dev versions only if no other
 stability is needed

---
 src/Composer/Repository/ComposerRepository.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Composer/Repository/ComposerRepository.php b/src/Composer/Repository/ComposerRepository.php
index 74ce15e8a..f7711390f 100644
--- a/src/Composer/Repository/ComposerRepository.php
+++ b/src/Composer/Repository/ComposerRepository.php
@@ -676,6 +676,10 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
             if ($acceptableStabilities === null || $stabilityFlags === null || StabilityFilter::isPackageAcceptable($acceptableStabilities, $stabilityFlags, array($name), 'dev')) {
                 $packageNames[$name.'~dev'] = $constraint;
             }
+            // if only dev stability is requested, we skip loading the non dev file
+            if (isset($acceptableStabilities['dev']) && count($acceptableStabilities) === 1 && count($stabilityFlags) === 0) {
+                unset($packageNames[$name]);
+            }
         }
 
         foreach ($packageNames as $name => $constraint) {