On 2016-12-03, mn wrote: > There might be some incorrect or unexpected behavior when switching > output engines in LyX, because Xetex does not support input-encoding > settings:
> To reproduce: > Start a document, go to setup: > - first try something for pdflatex and > define under language: input encodig to other (here it was utf8) > (then close dialog, reopen dialog and) Which encoding did you select? > - switch to fonts, set these to any combination of luatex/Xetex. Did you mean "tick the 'use non-TeX fonts'" button which activates the "fontspec" package for use of Unicode-encoded fonts? With "use non-TeX fonts", both the input encoding and the font encoding are set to "utf-8", overriding any setting under Settings>Language>Encoding. > Try to compile the document. > It will complain that inputenc is not suitable for the chosen engine. Not here. It just compiles. > But then going back to doc-settings and just trying to unset the > other(utf8)-option back to default is inaccessible (greyed out). > To do anything about that you have to first also unset your > font-settings back to choices for pdflatex. Did changing the input encoding setting under Language>Encoding help to make your document compile again? Which setting was required? Did it work with "non-TeX fonts" later? > This is wrong imho. > I think LyX should keep these settings for the usage case "switching > engines" but gracefully ignore inputenc settings for Xetex. > This was presumably intended to keep users from messing with inputenc > once Xetex was the chosen output engine for a document, but it is > confusing when you only find out later that you might have to use Xetex > instead of pdflatex. There is an important distinction between "use XeTeX/LuaTeX" and "use Unicode fonts" that even major LaTeX packages get wrong. Also, the custom counsel "use XeTeX" or "use LuaTeX" given to users with font problems or script problems is misleading. Switching the engine does not help without switching the fonts, too. Usually, this implies use of the "fontspec" package, in LyX by ticking the "use non-TeX fonts" button. You can use XeTeX or LuaTeX and 8-bit TeX fonts (and there are rare but valid use cases). However, because even the creators of the basic "inputenc" package did get this wrong and added a test, XeTeX can no longer be used with inputenc when the input encoding is set to something other than "ascii". Therefore, LyX overrides the user-choice in Settings>Language>Encoding with XeTeX and 8-bit TeX-fonts. This can lead to errors when the document contains characters that LyX cannot convert to ascii. Günter
