Dear LyX developers, in order to fix #10584, I need to call the function
features.require("textquotedbl") (to insert a some fallback definition in the preamble) in Paragraph::Private::latexSpecialChar. A similar action is done in InsetQuotes.cpp in void InsetQuotes::validate(LaTeXFeatures & features) const however, "LaTeXFeatures & features" is not defined in Paragraph.cpp. A "stub patch" (comment at the place of required change) is provided at http://www.lyx.org/trac/raw-attachment/ticket/10584/Paragraph.patch Thanks, Günter