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diff -up doxygen-1.9.1/src/context.cpp.me doxygen-1.9.1/src/context.cpp
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--- doxygen-1.9.1/src/context.cpp.me	2021-02-10 10:56:44.575251899 +0100
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+++ doxygen-1.9.1/src/context.cpp	2021-02-10 10:57:54.522809720 +0100
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@@ -4062,11 +4062,11 @@ class MemberContext::Private : public De
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         s_inst.addProperty("nameWithContextFor",  &Private::nameWithContextFor);
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         init=TRUE;
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       }
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-      if (md && !md->cookie()) { md->setCookie(new MemberContext::Private::Cachable(md)); }
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+      if (!md->cookie()) { md->setCookie(new MemberContext::Private::Cachable(md)); }
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       Cachable &cache = getCache();
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       cache.propertyAttrs.reset(TemplateList::alloc());
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-      if (md && md->isProperty())
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+      if (md->isProperty())
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       {
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         if (md->isGettable())           cache.propertyAttrs->append("get");
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         if (md->isPrivateGettable())    cache.propertyAttrs->append("private get");
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@@ -4076,7 +4076,7 @@ class MemberContext::Private : public De
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         if (md->isProtectedSettable())  cache.propertyAttrs->append("protected set");
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       }
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       cache.eventAttrs.reset(TemplateList::alloc());
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-      if (md && md->isEvent())
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+      if (md->isEvent())
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       {
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         if (md->isAddable())   cache.eventAttrs->append("add");
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         if (md->isRemovable()) cache.eventAttrs->append("remove");
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diff -up doxygen-1.9.1/src/docparser.cpp.me doxygen-1.9.1/src/docparser.cpp
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--- doxygen-1.9.1/src/docparser.cpp.me	2021-02-10 10:58:11.491500540 +0100
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+++ doxygen-1.9.1/src/docparser.cpp	2021-02-10 11:00:35.905512597 +0100
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@@ -1524,7 +1524,7 @@ reparsetoken:
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           {
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             QCString scope;
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             doctokenizerYYsetStateSetScope();
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-            doctokenizerYYlex();
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+            (void)doctokenizerYYlex();
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             scope = g_token->name;
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             g_context = scope;
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             //printf("Found scope='%s'\n",scope.data());
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diff -up doxygen-1.9.1/src/dotgroupcollaboration.cpp.me doxygen-1.9.1/src/dotgroupcollaboration.cpp
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--- doxygen-1.9.1/src/dotgroupcollaboration.cpp.me	2021-02-10 11:01:10.588530954 +0100
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+++ doxygen-1.9.1/src/dotgroupcollaboration.cpp	2021-02-10 11:02:54.216221350 +0100
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@@ -309,6 +309,7 @@ void DotGroupCollaboration::Edge::write(
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     {
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       if (first) first=FALSE; else t << "\\n";
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       t << DotNode::convertLabel(link->label);
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+      count++;
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     }
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     if (count==maxLabels) t << "\\n...";
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     t << "\"";