Stashing changes to avoid losing them on upgrade

Author: weaverryan

src/Flex.php

@@ -60,6 +60,7 @@
  */
 class Flex implements PluginInterface, EventSubscriberInterface
 {
+    public static $storedOperations = null;
     /**
      * @var Composer
      */
@@ -126,6 +127,15 @@ class_exists(__NAMESPACE__.str_replace('/', '\\', substr($file, \strlen(__DIR__)
         $this->config = $composer->getConfig();
         $this->options = $this->initOptions();
 
+        // if Flex is being upgraded, the original operations from the original Flex
+        // instance are stored in the static property, so we can reuse them now.
+        if (property_exists(Flex::class, 'storedOperations')) {
+            if (null !== Flex::$storedOperations) {
+                $this->operations = Flex::$storedOperations;
+                Flex::$storedOperations = null;
+            }
+        }
+
         $symfonyRequire = preg_replace('/\.x$/', '.x-dev', getenv('SYMFONY_REQUIRE') ?: ($composer->getPackage()->getExtra()['symfony']['require'] ?? ''));
 
         if ($composer2 = version_compare('2.0.0', PluginInterface::PLUGIN_API_VERSION, '<=')) {
@@ -293,6 +303,8 @@ class_exists(__NAMESPACE__.str_replace('/', '\\', substr($file, \strlen(__DIR__)
 
     public function deactivate(Composer $composer, IOInterface $io)
     {
+        // store operations in case Flex is being upgraded
+        self::$storedOperations = $this->operations;
         self::$activated = false;
     }