[LyX/master] Always use utf-8 in scripts with Python3

[Enrico Forestieri]

commit 48a065e89effb4029c779328498f62f751c4b12d
Author: Enrico Forestieri <forenr at lyx.org>
Date:   Thu Jan 25 10:17:23 2024 +0100

    Always use utf-8 in scripts with Python3
    
    In order to perform a conversion of graphic format LyX generates
    a python script containing the path of the original file to convert.
    While Python2 needs the file in the native encoding of the OS, in
    Python3 the encoding has to strictly be how announced by the first
    line of a script, in our case utf-8.
---
 src/graphics/GraphicsConverter.cpp |   14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/graphics/GraphicsConverter.cpp b/src/graphics/GraphicsConverter.cpp
index c97e766..669f08d 100644
--- a/src/graphics/GraphicsConverter.cpp
+++ b/src/graphics/GraphicsConverter.cpp
@@ -136,9 +136,17 @@ Converter::Impl::Impl(Converter const & parent, FileName const & doc_fname,
 
 	// The conversion commands are stored in a stringstream
 	ostringstream script;
-	build_script(doc_fname_.absFileName(), from_file.toFilesystemEncoding(),
-		     to_file_.toFilesystemEncoding(),
-		     from_format, to_format, script);
+	if (os::python_info()[0] == '2') {
+		build_script(doc_fname_.absFileName(),
+			     from_file.toFilesystemEncoding(),
+			     to_file_.toFilesystemEncoding(),
+			     from_format, to_format, script);
+	} else {
+		build_script(doc_fname_.absFileName(),
+			     from_file.absFileName(),
+			     to_file_.absFileName(),
+			     from_format, to_format, script);
+	}
 	LYXERR(Debug::GRAPHICS, "\tConversion script:"
 		   "\n--------------------------------------\n"
 		<< script.str()