[LyX/master] Load externally referred buffers and initialize their labels

commit 5f7a66e3efe65363afd400e178961631510effbd
Author: Juergen Spitzmueller <[email protected]>
Date:   Sat Apr 11 12:07:46 2026 +0200

    Load externally referred buffers and initialize their labels
---
 src/Buffer.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index d9af5c4e46..5471f89cfa 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -2560,8 +2560,16 @@ void Buffer::registerExternalRefs(FileName fn) const
 
 	vector<FileName>::const_iterator temp =
 		find(d->external_xrefed_files_.begin(), d->external_xrefed_files_.end(), fn);
-	if (temp == d->external_xrefed_files_.end())
+	if (temp == d->external_xrefed_files_.end()) {
 		d->external_xrefed_files_.push_back(fn);
+		// we also need to load these files in the background
+		// and update their buffer to get valid ref insets
+		if (!theBufferList().getBuffer(fn)) {
+			Buffer * xb = checkAndLoadLyXFile(fn, true);
+			if (xb)
+				xb->updateBuffer();
+		}
+	}
 }
 
 
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