1 files changed, 10 insertions, 5 deletions
diff --git a/libqpdf/QPDFPageDocumentHelper.cc b/libqpdf/QPDFPageDocumentHelper.cc
index 1dacd672..fa50c471 100644
--- a/libqpdf/QPDFPageDocumentHelper.cc
+++ b/libqpdf/QPDFPageDocumentHelper.cc
@@ -141,11 +141,7 @@ QPDFPageDocumentHelper::flattenAnnotationsForPage(
             QTC::TC("qpdf", "QPDFPageDocumentHelper skip widget need appearances");
             process = false;
         }
-        if (process && (! as.isStream()))
-        {
-            process = false;
-        }
-        if (process)
+        if (process && as.isStream())
         {
             if (is_widget)
             {
@@ -200,6 +196,15 @@ QPDFPageDocumentHelper::flattenAnnotationsForPage(
             }
             new_content += content;
         }
+        else if (process)
+        {
+            // If an annotation has no appearance stream, just drop
+            // the annotation when flattening. This can happen for
+            // unchecked checkboxes and radio buttons, popup windows
+            // associated with comments that aren't visible, and other
+            // types of annotations that aren't visible.
+            QTC::TC("qpdf", "QPDFPageDocumentHelper ignore annotation with no appearance");
+        }
         else
         {
             new_annots.push_back(aoh.getObjectHandle());