Use explicit name: lookups for LuaTeX (#462)

fontspec-code-internal.dtx

@@ -288,7 +288,8 @@
 %    \begin{macrocode}
 \cs_new:Nn \@@_font_is_name:
   {
-    \cs_set_eq:NN \@@_fontname_wrap:n \use:n
+%<XE>  \cs_set_eq:NN \@@_fontname_wrap:n \use:n
+%<LU>  \cs_set:Npn \@@_fontname_wrap:n ##1 { name: ##1 }
   }
 %    \end{macrocode}
 %

testfiles/fontload-fontname.luatex.tlg

@@ -0,0 +1,16 @@
+This is a generated file for the l3build validation system.
+Don't change this file in any respect.
+RM:
+TU/TeXGyrePagella(0)/m/n:
+  name:TeXGyrePagella:mode=node;script=latn;language=dflt;+tlig;
+BF:
+TU/TeXGyrePagella(0)/b/n:
+  name:TeXGyrePagella/B:mode=node;script=latn;language=dflt;+tlig;
+IT:
+TU/TeXGyrePagella(0)/m/it:
+  name:TeXGyrePagella/I:mode=node;script=latn;language=dflt;+tlig;
+BFIT:
+TU/TeXGyrePagella(0)/b/it:
+  name:TeXGyrePagella/BI:mode=node;script=latn;language=dflt;+tlig;
+***************
+Compilation 1 of test file completed with exit status 0

testfiles/fontload-fontname.lvt

@@ -0,0 +1,30 @@
+\input{fontspec-testsetup.tex}
+
+\usepackage{fontspec}
+
+\begin{document}
+% Only test in LuaTeX since in XeTeX it's unclear if the fonts ar available
+\LUATEXONLY
+
+\setmainfont{TeX Gyre Pagella}
+
+\MSG{RM:}
+`hello' 123
+\CURRNFSS
+
+\MSG{BF:}
+\bfseries
+`hello' 123
+\CURRNFSS
+
+\MSG{IT:}
+\mdseries\itshape
+`hello' 123
+\CURRNFSS
+
+\MSG{BFIT:}
+\bfseries
+`hello' 123
+\CURRNFSS
+
+\end{document}

testfiles/fontload-fontname.tlg

@@ -0,0 +1,5 @@
+This is a generated file for the l3build validation system.
+Don't change this file in any respect.
+*** LuaTeX-only test ***
+***************
+Compilation 1 of test file completed with exit status 0