Avoid showing alias versions in show command, show the original version

src/Composer/Command/ShowCommand.php

@@ -18,6 +18,7 @@ use Composer\Json\JsonFile;
 use Composer\Package\BasePackage;
 use Composer\Package\CompletePackageInterface;
 use Composer\Package\Link;
+use Composer\Package\AliasPackage;
 use Composer\Package\PackageInterface;
 use Composer\Package\Version\VersionParser;
 use Composer\Package\Version\VersionSelector;
@@ -365,6 +366,9 @@ EOT
                         || !is_object($packages[$type][$package->getName()])
                         || version_compare($packages[$type][$package->getName()]->getVersion(), $package->getVersion(), '<')
                     ) {
+                        while ($package instanceof AliasPackage) {
+                            $package = $package->getAliasOf();
+                        }
                         if (!$packageFilterRegex || preg_match($packageFilterRegex, $package->getName())) {
                             if (!$packageListFilter || in_array($package->getName(), $packageListFilter, true)) {
                                 $packages[$type][$package->getName()] = $package;