Please describe the problem:
If the brief documentation contains a double-quote character, it is reproduced verbatim in the XML output, which leads to a corrupted XML document.

Steps to reproduce:
1. Document a function with something like:
/** "test" documentation. */
void MyFunc()
2. Run doxygen with XML output

Actual results:
The code-listing will contain invalid XML like:
<ref refid="id123" kindref="function" tooltip=""test" documentation.">MyFunc</ref>

Expected results:
It should be escaped:
<ref refid="id123" kindref="function" tooltip="&#34;test&#34; documentation.">MyFunc</ref>

Does this happen every time?
Yes

Other information: