[LyX/master] Adapt to deprecation of \DeclareCollectionInstance

[Scott Kostyshak]

commit 1a87c5313d37ffa01037b4443d81d636319cb834
Author: Scott Kostyshak <skostysh at lyx.org>
Date:   Sun Jun 16 11:41:46 2024 -0400

    Adapt to deprecation of \DeclareCollectionInstance
    
    Change LaTeX output of smallLetterFrac. For more information, see:
    
      https://tex.stackexchange.com/questions/720579/do-i-need-to-replace-declarecollectioninstance-after-recent-package-change/
    
    This fixes 44 failing tests from 074-76-letterlike-numberforms-arrows.lyx
    that started failing after a tlmgr update around 2024-06-04.
---
 src/LaTeXFeatures.cpp | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/src/LaTeXFeatures.cpp b/src/LaTeXFeatures.cpp
index e68f850d0a..74941459e6 100644
--- a/src/LaTeXFeatures.cpp
+++ b/src/LaTeXFeatures.cpp
@@ -471,19 +471,11 @@ static docstring const textschwa_def = from_ascii(
 static docstring const xfrac_def = from_ascii(
 	   "\\usepackage{xfrac}\n");
 
+// https://tex.stackexchange.com/questions/720579/do-i-need-to-replace-declarecollectioninstance-after-recent-package-change/
 static docstring const smallLetterFrac_def = from_ascii(
-	"\\DeclareCollectionInstance{smallLetterFrac}{xfrac}{default}{text}\n"
+	"\\EditTemplateDefaults{xfrac}{text}\n"
 	"  {phantom=c, scale-factor=1.0, slash-left-kern=-.05em}\n"
-	"\\DeclareCollectionInstance{smallLetterFrac}{xfrac}{lmr}{text}\n"
-	"  {slash-symbol-font=ptm, phantom=c, scale-factor=1, slash-left-kern=-.05em}\n"
-	"\\DeclareCollectionInstance{smallLetterFrac}{xfrac}{lmss}{text}\n"
-	"  {slash-symbol-font=ptm, phantom=c, scale-factor=1, slash-left-kern=-.05em}\n"
-	"\\DeclareCollectionInstance{smallLetterFrac}{xfrac}{cmr}{text}\n"
-	"  {slash-symbol-font=ptm, phantom=c, scale-factor=1, slash-left-kern=-.05em}\n"
-	"\\DeclareCollectionInstance{smallLetterFrac}{xfrac}{cmss}{text}\n"
-	"  {slash-symbol-font=ptm, phantom=c, scale-factor=1, slash-left-kern=-.05em}\n"
-	"\\newcommand{\\smallLetterFrac}[2]{%\n"
-	"  {\\UseCollection{xfrac}{smallLetterFrac}\\sfrac{#1}{#2}}}\n");
+	"\\NewCommandCopy\\smallLetterFrac\\sfrac\n");
 
 static docstring const lyxref_def = from_ascii(
 	"\\RS at ifundefined{subsecref}\n"