bug #696 Fix support for ".x" branches (nicolas-grekas)

This PR was merged into the 1.8-dev branch.

Discussion
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Fix support for ".x" branches

This also fixes support for branch `5.x`

Commits
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0c662de Fix support for ".x" branches

Author: nicolas-grekas

src/PackageFilter.php

@@ -99,9 +99,10 @@ private function getVersions(): array
             foreach ($vers as $i => $v) {
                 if (!isset($okVersions[$v])) {
                     $okVersions[$v] = false;
+                    $w = '.x' === substr($v, -2) ? $versions['next'] : $v;
 
                     for ($j = 0; $j < 60; ++$j) {
-                        if ($this->symfonyConstraints->matches(new Constraint('==', $v.'.'.$j.'.0'))) {
+                        if ($this->symfonyConstraints->matches(new Constraint('==', $w.'.'.$j.'.0'))) {
                             $okVersions[$v] = true;
                             break;
                         }