Reworking check for a clean index

Author: weaverryan

src/Command/UpdateRecipesCommand.php

@@ -390,11 +390,15 @@ private function askForPackage(IOInterface $io, Lock $symfonyLock): ?string
     private function isIndexClean(IOInterface $io): bool
     {
         $processExecutor = new ProcessExecutor($io);
-        if (0 !== $processExecutor->execute('git diff-files --quiet --ignore-submodules')) {
+        $output = '';
+
+        $processExecutor->execute('git diff --cached --name-only', $output, $this->rootDir);
+        if ('' !== trim($output)) {
             return false;
         }
 
-        if (0 !== $processExecutor->execute('git diff-index --cached --quiet --ignore-submodules HEAD --')) {
+        $processExecutor->execute('git diff --name-only', $output, $this->rootDir);
+        if ('' !== trim($output)) {
             return false;
         }