Copy subdictionaries when removing resources (fixes #276)

When removing unreferenced resources, the code was copying the overall
resource dictionaries but not the subdictionaries being modified. This
was a "typo" in the code -- the comment clearly stated the need to do
this, but the code replaced the dictionary with itself rather than
with a shallow copy of itself.

1 files changed, 1 insertions, 0 deletions

diff --git a/libqpdf/QPDFPageObjectHelper.cc b/libqpdf/QPDFPageObjectHelper.cc
index 611f33ea..ba647372 100644
--- a/libqpdf/QPDFPageObjectHelper.cc
+++ b/libqpdf/QPDFPageObjectHelper.cc
@@ -156,6 +156,7 @@ QPDFPageObjectHelper::removeUnreferencedResources()
         {
             continue;
         }
+        dict = dict.shallowCopy();
         resources.replaceKey(*d_iter, dict);
         std::set<std::string> keys = dict.getKeys();
         for (std::set<std::string>::iterator k_iter = keys.begin();