[lltx] How to specify an instance name with a space for a variable font in luaotfload

[Bruno Voisin]

Looking closer, this seems a mode-specific issue: in harf mode, "instance=Light Extended" works just fine, but in (default) node mode it doesn't.

Attached is the output of

	\input luaotfload.sty
	\parindent=0pt
	\parskip=0pt

	\def\fonttest#1{%
	  \font\testfont="#1"\relax
	  {\testfont ABCDEFGHIJKLM}\par}

	\fonttest{Skia}
	\fonttest{Skia:instance=Light Extended}
	\fonttest{Skia:mode=harf;instance=Light Extended}

	\bigskip

	\fonttest{[STIXTwoText-Italic.ttf]}
	\fonttest{[STIXTwoText-Italic.ttf]:instance=SemiBold Italic}
	\fonttest{[STIXTwoText-Italic.ttf]:mode=harf;instance=SemiBold Italic}

	\bye

Skia.ttf is Apple's Skia font, and STIXTwoText-Italic.ttf is STIXTwoText-Italic[wght].ttf from the STIX Two fonts release 2.13b171, renamed.

Bruno Voisin

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