[LyX/master] Do not use babel quotation mark macros with non-TeX fonts

[Juergen Spitzmueller]

commit dc38b66e603b121f41113e6d8140be62bd65807a
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Sat Dec 10 17:25:04 2016 +0100

    Do not use babel quotation mark macros with non-TeX fonts
    
    These rely on [O]T1 font encoding.
    
    Also, add some comments.
---
 src/insets/InsetQuotes.cpp |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/insets/InsetQuotes.cpp b/src/insets/InsetQuotes.cpp
index 29d9251..6e19a1b 100644
--- a/src/insets/InsetQuotes.cpp
+++ b/src/insets/InsetQuotes.cpp
@@ -266,20 +266,27 @@ void InsetQuotes::latex(otexstream & os, OutputParams 
const & runparams) const
        else if (language_ == FrenchQuotes && times_ == DoubleQuotes
            && prefixIs(runparams.local_font->language()->code(), "fr")
            && !runparams.use_polyglossia) {
+               // Specific guillemets of French babel
+               // including correct French spacing
                if (side_ == LeftQuote)
                        qstr = "\\og "; //the spaces are important here
                else
                        qstr = " \\fg{}"; //and here
        } else if (fontenc_ == "T1" && !runparams.use_polyglossia) {
+               // Quotation marks for T1 font encoding
+               // (using ligatures)
                qstr = latex_quote_t1[times_][quoteind];
 #ifdef DO_USE_DEFAULT_LANGUAGE
        } else if (doclang == "default") {
 #else
-       } else if (!runparams.use_babel) {
+       } else if (!runparams.use_babel || runparams.isFullUnicode()) {
 #endif
-               // these are also used by polyglossia
+               // Standard quotation mark macros
+               // These are also used by polyglossia
+               // and babel without fontenc (XeTeX/LuaTeX)
                qstr = latex_quote_ot1[times_][quoteind];
        } else {
+               // Babel shorthand quotation marks (for T1/OT1)
                qstr = latex_quote_babel[times_][quoteind];
        }