bug #968 Fix keeping platform requirements when rebooting composer (nicolas-grekas)

This PR was merged into the 1.x branch.

Discussion
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Fix keeping platform requirements when rebooting composer

Commits
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9aca8f3 Fix keeping platform requirements when rebooting composer

Author: nicolas-grekas

src/Flex.php

@@ -1058,6 +1058,9 @@ private function reinstall(Event $event, bool $update)
             $composer->getEventDispatcher(),
             $composer->getAutoloadGenerator()
         );
+        if (method_exists($installer, 'setPlatformRequirementFilter')) {
+            $installer->setPlatformRequirementFilter(((array) $this->installer)["\0*\0platformRequirementFilter"]);
+        }
 
         if (!$update && method_exists($installer, 'setUpdateAllowList')) {
             $installer->setUpdateAllowList(['php']);