[system/dolphin] src: When archive KIO claims unsupported, offer opening in archiver

Git commit 235c73efa2170f2a67ca61975abb34da6ff97b95 by Kai Uwe Broulik.
Committed on 23/07/2026 at 12:21.
Pushed by broulik into branch 'master'.

When archive KIO claims unsupported, offer opening in archiver

There are cases where KArchive doesn't support a given archive
but Ark would open it just fine.

While not necessarily great UX, this at least gives the user
a quick way out to try a "proper" archiver.

M  +26   -0    src/dolphinviewcontainer.cpp
M  +2    -0    src/dolphinviewcontainer.h

https://invent.kde.org/system/dolphin/-/commit/235c73efa2170f2a67ca61975abb34da6ff97b95

diff --git a/src/dolphinviewcontainer.cpp b/src/dolphinviewcontainer.cpp
index 968919b636..530021caa2 100644
--- a/src/dolphinviewcontainer.cpp
+++ b/src/dolphinviewcontainer.cpp
@@ -1055,6 +1055,32 @@ void DolphinViewContainer::slotErrorMessageFromView(const QString &message, cons
         }
         showMessage(message, KMessageWidget::Error, {m_createFolderAction});
         return;
+    } else if (kioErrorCode == KIO::ERR_WORKER_DEFINED) {
+        QUrl url = m_view->url();
+        const QStringList archiveTypes = KProtocolInfo::archiveMimetypes(url.scheme());
+        // When archive KIO claims unsupported, offer opening in archive viewer.
+        if (!archiveTypes.isEmpty()) {
+            url.setScheme(QStringLiteral("file"));
+
+            if (auto archiverService = KApplicationTrader::preferredService(archiveTypes.first())) {
+                if (!m_openInArchiveViewer) {
+                    m_openInArchiveViewer = new QAction(this);
+                    connect(m_openInArchiveViewer, &QAction::triggered, this, [this, url] {
+                        KIO::OpenUrlJob *job = new KIO::OpenUrlJob(url);
+                        // Auto*Warning*Handling, errors are put in a KMessageWidget by us in slotOpenUrlFinished.
+                        job->setUiDelegate(KIO::createDefaultJobUiDelegate(KJobUiDelegate::AutoWarningHandlingEnabled, this));
+                        job->setShowOpenOrExecuteDialog(true);
+                        connect(job, &KIO::OpenUrlJob::finished, this, &DolphinViewContainer::slotOpenUrlFinished);
+                        job->start();
+                    });
+                }
+                // Updating icon and name every time, preferred service might have changed.
+                m_openInArchiveViewer->setText(i18nc("@action:button", "Open with %1", archiverService->name()));
+                m_openInArchiveViewer->setIcon(QIcon::fromTheme(archiverService->icon()));
+                showMessage(message, KMessageWidget::Error, {m_openInArchiveViewer});
+                return;
+            }
+        }
     }
     Q_EMIT showErrorMessage(message);
 }
diff --git a/src/dolphinviewcontainer.h b/src/dolphinviewcontainer.h
index 9c6dbb611f..217292b70e 100644
--- a/src/dolphinviewcontainer.h
+++ b/src/dolphinviewcontainer.h
@@ -506,6 +506,8 @@ private:
     QAction *m_createFolderAction;
     /// An action to open the url as file instead of as directory. Lazily initialized.
     QAction *m_openAsFile = nullptr;
+    /// An action to open the url in the default archive viewer. Lazily initialized.
+    QAction *m_openInArchiveViewer = nullptr;
 
     KMessageWidget *m_messageWidget;