Don't flush FPC when not asking for it explicitly.

Author: hostep

app/code/Magento/Backend/Console/Command/CacheCleanCommand.php

@@ -32,7 +32,10 @@ protected function configure()
      */
     protected function performAction(array $cacheTypes)
     {
-        $this->eventManager->dispatch('adminhtml_cache_flush_system');
+        if ($cacheTypes === [] || in_array('full_page', $cacheTypes)) {
+            $this->eventManager->dispatch('adminhtml_cache_flush_system');
+        }
+
         $this->cacheManager->clean($cacheTypes);
     }
 

app/code/Magento/Backend/Console/Command/CacheFlushCommand.php

@@ -32,7 +32,10 @@ protected function configure()
      */
     protected function performAction(array $cacheTypes)
     {
-        $this->eventManager->dispatch('adminhtml_cache_flush_all');
+        if ($cacheTypes === [] || in_array('full_page', $cacheTypes)) {
+            $this->eventManager->dispatch('adminhtml_cache_flush_all');
+        }
+
         $this->cacheManager->flush($cacheTypes);
     }