[LyX/master] Fix math preview of Japanese text for UTF-8 encoding

commit e74e17c0ba8cdb09fa8ac6263e858ce4b3a29abf
Author: Koji Yokota <[email protected]>
Date:   Fri Apr 10 17:24:05 2026 +0900

    Fix math preview of Japanese text for UTF-8 encoding
    
    Since dvipng cannot support Japanese text directly, we adopt
       latex + (bxcjkjatype package) -> pdf -> png
    path instead of
       platex -> dvipng.
    
    Fix is limited to UTF-8 encoding.
---
 src/graphics/PreviewLoader.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/graphics/PreviewLoader.cpp b/src/graphics/PreviewLoader.cpp
index 7fa7dfb456..0d185b4350 100644
--- a/src/graphics/PreviewLoader.cpp
+++ b/src/graphics/PreviewLoader.cpp
@@ -626,7 +626,7 @@ void PreviewLoader::Impl::startLoading(bool wait)
 					? buffer_.params().getOutputFlavor()
 					: Flavor::LaTeX;
 	if (buffer_.params().encoding().package() == Encoding::japanese) {
-		latexparam = " --latex=platex";
+		latexparam = " --latex=pdflatex";
 		flavor = Flavor::LaTeX;
 	}
 	else if (buffer_.params().useNonTeXFonts) {
@@ -850,6 +850,11 @@ void PreviewLoader::Impl::dumpPreamble(otexstream & os, Flavor flavor) const
 	os << "\n"
 	   << "\\usepackage[active,delayed,showlabels,lyx]{preview}\n"
 	   << "\n";
+	if (buffer_.params().encoding().package() == Encoding::japanese) {
+		os << "\n"
+		   << "\\usepackage[whole]{bxcjkjatype}\n"
+		   << "\n";
+	}
 }
 
 
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