Blame doxygen-1.9.1-crash_in_docparser.patch

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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 10:52:09.481086282 +0100
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+++ doxygen-1.9.1/src/docparser.cpp	2021-02-10 10:55:32.418781686 +0100
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@@ -951,7 +951,7 @@ static void handlePendingStyleCommands(D
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       children.append(new DocStyleChange(parent,g_nodeStack.count(),sc->style(),sc->tagName(),FALSE));
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       g_initialStyleStack.push(sc);
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       g_styleStack.pop();
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-      sc = g_styleStack.top();
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+      sc = !g_styleStack.isEmpty() ? g_styleStack.top() : 0;
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     }
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   }
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 }