[pim/kleopatra/release/26.08] src/crypto/gui: Avoid crash while updating widgets for unknown recipients

Git commit a25f30faed2b3416bca8f3a277b38d16195ff485 by Ingo Klöcker, on behalf of Ingo Klöcker.
Committed on 27/07/2026 at 14:00.
Pushed by kloecker into branch 'release/26.08'.

Avoid crash while updating widgets for unknown recipients

We have to iterate over a copy of mUnknownWidgets because the list might
be modified during iteration.

Suggested-by: Vadim
CCBUG: 523471
(cherry picked from commit 8d1e8f46654a1c05e62447c62068e5b49d96e879)

M  +3    -1    src/crypto/gui/signencryptwidget.cpp

https://invent.kde.org/pim/kleopatra/-/commit/a25f30faed2b3416bca8f3a277b38d16195ff485

diff --git a/src/crypto/gui/signencryptwidget.cpp b/src/crypto/gui/signencryptwidget.cpp
index 1213e3861..57d36440e 100644
--- a/src/crypto/gui/signencryptwidget.cpp
+++ b/src/crypto/gui/signencryptwidget.cpp
@@ -643,7 +643,9 @@ void SignEncryptWidget::addUnknownRecipient(const char *keyID)
 
     connect(KeyCache::instance().get(), &Kleo::KeyCache::keysMayHaveChanged, this, [this]() {
         // Check if any unknown recipient can now be found.
-        for (auto w : std::as_const(d->mUnknownWidgets)) {
+        // Iterate over a copy because mUnknownWidgets might be modified in the loop
+        const auto unknownWidgets = d->mUnknownWidgets;
+        for (auto w : unknownWidgets) {
             auto key = KeyCache::instance()->findByKeyIDOrFingerprint(w->keyID().toLatin1().constData());
             if (key.isNull()) {
                 std::vector<std::string> subids;