File PYPEnglishCandidates-fix-vector-iterator-invalidation.patch of Package ibus-libpinyin

From 74916128a0a7dc6afdc7a0dbbe4e1a501d357531 Mon Sep 17 00:00:00 2001
From: Hillwood Yang <hillwood@opensuse.org>
Date: Sun, 11 Jan 2026 20:22:05 +0800
Subject: [PATCH] Fix a crash issue

https://github.com/libpinyin/ibus-libpinyin/issues/549
Fix potential iterator undefined behavior in PYPEnglishCandidates.cc
by replacing iterator-based insertion with index-based insertion into
the candidates vector.
---
 src/PYPEnglishCandidates.cc | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/PYPEnglishCandidates.cc b/src/PYPEnglishCandidates.cc
index 0da60a99..94bbe22d 100644
--- a/src/PYPEnglishCandidates.cc
+++ b/src/PYPEnglishCandidates.cc
@@ -49,8 +49,9 @@ EnglishCandidates::processCandidates (std::vector<EnhancedCandidate> & candidate
     const char *prefix = m_editor->m_text.c_str ();
     std::vector<std::string> words;
 
-    std::vector<EnhancedCandidate>::iterator pos;
-    for (pos = candidates.begin (); pos != candidates.end (); ++pos) {
+    // Find the insertion position
+    size_t insert_index = 0;
+    for (auto pos = candidates.begin (); pos != candidates.end (); ++pos, ++insert_index) {
         if (CANDIDATE_NBEST_MATCH != pos->m_candidate_type &&
             CANDIDATE_LONGER != pos->m_candidate_type &&
             CANDIDATE_LONGER_USER != pos->m_candidate_type)
@@ -72,7 +73,9 @@ EnglishCandidates::processCandidates (std::vector<EnhancedCandidate> & candidate
 
             enhanced.m_candidate_id = count;
             enhanced.m_display_string = *iter;
-            candidates.insert (pos + count, enhanced);
+
+            // Use an integer index to avoid iterator UB
+            candidates.insert(candidates.begin() + insert_index + count, enhanced);
 
             ++count;
         }