does not work if using non-tex fonts. It does not depend on which latex one uses (lualatex/xetex). For tex-fonts, using pdflatex it works as expected.
The background for currently edited math (that is: the cursor is inside math
fomula)
is OK (reflects setting for ...>math background).
To test:
1.) open new file xx.lyx
2.) check: Document->Settings...->Fonts->Use non-TeX fonts
3.) Tools->Preferences...->File Handling->File Formats->With non-TeX fonts: PDF
(LuaTeX) # or PDF (XeTeX)
4.) insert a formula, e.g. M-x math-insert \sqrt2
save and exit lyx (Important, so the the preview is done with the changed
settings
5.) lyx xx.lyx
6.) move cursor outside of the formula
7.) Tools->Preferences...->Colors->background
select anything, Apply
Background of math is not changing --> NOT OK
8.) uncheck: Document->Settings...->Fonts->Use non-TeX fonts
9.) save, exit lyx, restart lyx
Background of previewed math is as desired
Kornel
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