Supplement the fix for bug #11586

The mhchem \ce inset is a text mode environment but allows entering
spaces and mathmode commands. However, even if it doesn't allow unicode
symbols, LyX allows entering them (by copy/paste, for example), causing
latex errors. As a unicode symbol may have a proper latex representation
from the unicodesymbols file, use it instead of the bare symbol. Here, we
don't care about the mode because both text and math mode should be allowed.
For example, the ⟶ symbol is not recognized but its latex representation
(\longrightarrow) is fine. Of course, there may be symbols that are
not recognized anyway, but this is better because they cause explicit
errors from mhchem instead of cryptic iconv errors in case they cannot
be represented in the document encoding.

src/mathed/MathExtern.cpp

@@ -1421,11 +1421,46 @@ void write(MathData const & dat, WriteStream & wi)
 
 void writeString(docstring const & s, WriteStream & os)
 {
-	if (!os.latex() || os.lockedMode()) {
+	if (!os.latex()) {
 		os << (os.asciiOnly() ? escape(s) : s);
 		return;
 	}
 
+	if (os.lockedMode()) {
+		bool space;
+		docstring cmd;
+		for (char_type c : s) {
+			try {
+				Encodings::latexMathChar(c, false, os.encoding(), cmd, space);
+				os << cmd;
+				os.pendingSpace(space);
+			} catch (EncodingException const & e) {
+				switch (os.output()) {
+				case WriteStream::wsDryrun: {
+					os << "<" << _("LyX Warning: ")
+					   << _("uncodable character") << " '";
+					os << docstring(1, e.failed_char);
+					os << "'>";
+					break;
+				}
+				case WriteStream::wsPreview: {
+					// indicate the encoding error by a boxed '?'
+					os << "{\\fboxsep=1pt\\fbox{?}}";
+					LYXERR0("Uncodable character" << " '"
+						<< docstring(1, e.failed_char)
+						<< "'");
+					break;
+				}
+				case WriteStream::wsDefault:
+				default:
+					// throw again
+					throw(e);
+				}
+			}
+		}
+		return;
+	}
+
 	docstring::const_iterator cit = s.begin();
 	docstring::const_iterator end = s.end();