[LyX/master] Handle bibtex location field syntax file1;file2

[Juergen Spitzmueller]

commit ea55ca5e84f0a4b7f8143ef21336fecbabb76300
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sat Sep 9 12:57:51 2023 +0200

    Handle bibtex location field syntax file1;file2
    
    This is used, for instance, by zotero with the "betterbibtex" exporter
    
    See #12896
---
 src/BiblioInfo.cpp |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/BiblioInfo.cpp b/src/BiblioInfo.cpp
index c5094b2..63eb2f2 100644
--- a/src/BiblioInfo.cpp
+++ b/src/BiblioInfo.cpp
@@ -686,16 +686,22 @@ void BibTeXInfo::getLocators(docstring & doi, docstring & url, docstring & file)
 		// get "file" entry from citation record
 		file = operator[]("file");
 
-		// Jabref case, field has a format:
+		// Jabref case, "file" field has a format (depending on exporter):
 		// Description:Location:Filetype;Description:Location:Filetype...
+		// or simply:
+		// Location;Location;...
 		// We will strip out the locations and return an \n-separated list
 		if (!file.empty()) {
 			docstring filelist;
 			vector<docstring> files = getVectorFromString(file, from_ascii(";"));
 			for (auto const & f : files) {
+				// first try if we have Description:Location:Filetype
 				docstring ret, filedest, tmp;
 				ret = split(f, tmp, ':');
 				tmp = split(ret, filedest, ':');
+				if (filedest.empty())
+					// we haven't, so use the whole string
+					filedest = f;
 				// TODO howto deal with relative directories?
 				FileName fn(to_utf8(filedest));
 				if (fn.exists()) {
@@ -708,7 +714,7 @@ void BibTeXInfo::getLocators(docstring & doi, docstring & url, docstring & file)
 				file = filelist;
 		}
 
-		// kbibtex case, format:
+		// kbibtex case, "localfile" field with format:
 		// file1.pdf;file2.pdf
 		// We will strip out the locations and return an \n-separated list
 		docstring kfile;