[LyX/master] Error if tex file has a preamble but no (accessible) \begin{document} (#13297)

commit b1a75e7ffa969cfacc6c3fa7088476999d5b0ae0
Author: Juergen Spitzmueller <[email protected]>
Date:   Wed Apr 8 08:52:45 2026 +0200

    Error if tex file has a preamble but no (accessible) \begin{document} (#13297)
---
 src/tex2lyx/Preamble.cpp | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/tex2lyx/Preamble.cpp b/src/tex2lyx/Preamble.cpp
index 3ee922054b..3137e2df74 100644
--- a/src/tex2lyx/Preamble.cpp
+++ b/src/tex2lyx/Preamble.cpp
@@ -2762,6 +2762,10 @@ void Preamble::parse(Parser & p, string const & forceclass,
 		class_set = true;
 	}
 
+	// if we have a full document, check that we have
+	// a body (see #13297)
+	bool complete_preamble = false;
+
 	while (is_full_document && p.good()) {
 		if (detectEncoding && h_inputencoding != "auto-legacy" &&
 		    h_inputencoding != "auto-legacy-plain")
@@ -3546,8 +3550,10 @@ void Preamble::parse(Parser & p, string const & forceclass,
 
 		if (t.cs() == "begin") {
 			string const name = p.getArg('{', '}');
-			if (name == "document")
+			if (name == "document") {
+				complete_preamble = true;
 				break;
+			}
 			h_preamble << "\\begin{" << name << "}";
 			continue;
 		}
@@ -3765,6 +3771,11 @@ void Preamble::parse(Parser & p, string const & forceclass,
 		}
 	}
 
+	if (is_full_document && !complete_preamble) {
+		error_message("Found preamble but not \\begin{document}. Aborting!");
+		exit(EXIT_FAILURE);
+	}
+
 	// set textclass if not yet done (snippets without \documentclass and forced class)
 	if (!class_set) 
 		setTextClass(h_textclass, tc);
-- 
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