Issue 5870 - Implement the new ElemHideEmulation filter type

compiled/filter/Filter.cpp

Index: compiled/filter/Filter.cpp
===================================================================
--- a/compiled/filter/Filter.cpp
+++ b/compiled/filter/Filter.cpp
@@ -145,17 +145,20 @@
       if (static_cast<ElemHideEmulationFilter*>(filter.get())->IsGeneric())
         filter = FilterPtr(new InvalidFilter(text, u"filter_elemhideemulation_nodomain"_str), false);
       break;
     default:
       // This should never happen but just in case
       return nullptr;
   }
 
-  // This is a hack: we looked up the entry using text but create it using
-  // filter->mText. This works because both are equal at this point. However,
-  // text refers to a temporary buffer which will go away.
   enter_context("Adding to known filters");
-  knownFilter.assign(filter->mText, filter.get());
+  if (text != filter->mText)
+    knownFilters[filter->mText] = filter.get();
+  else
+    // This is a hack: we looked up the entry using text but create it using
+    // filter->mText. This works because both are equal at this point. However,
+    // text refers to a temporary buffer which will go away.
+    knownFilter.assign(filter->mText, filter.get());
   exit_context();
 
   return filter.release();
 }