bug #870 Honor --no-scripts (nicolas-grekas)

This PR was merged into the 1.x branch.

Discussion
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Honor --no-scripts

Fix #860

Commits
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7d59bcd Honor --no-scripts

Author: nicolas-grekas

src/Flex.php

@@ -986,7 +986,10 @@ private function unpack(Event $event)
     private function reinstall(Event $event, bool $update)
     {
         $event->stopPropagation();
-        $composer = Factory::create($this->io);
+
+        $ed = $composer->getEventDispatcher();
+        $disableScripts = !method_exists($ed, 'setRunScripts') || !((array) $ed)["\0*\0runScripts"];
+        $composer = Factory::create($this->io, null, false, $disableScripts);
 
         $installer = clone $this->installer;
         $installer->__construct(