Fix java.lang.RuntimeException: Document is locked by write PSI operations errors

Author: facboy

idea_plugin/src/main/java/com/google/googlejavaformat/intellij/GoogleJavaFormatImportOptimizer.java

@@ -65,6 +65,11 @@ public boolean supports(@NotNull PsiFile file) {
       return Runnables.doNothing();
     }
 
-    return () -> document.setText(text);
+    return () -> {
+      if (documentManager.isDocumentBlockedByPsi(document)) {
+        documentManager.doPostponedOperationsAndUnblockDocument(document);
+      }
+      document.setText(text);
+    };
   }
 }