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diff --git a/src/savequerydialog.h b/src/savequerydialog.h
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+++ b/src/savequerydialog.h
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+/*
+ * qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
+ * Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#pragma once
+
+#include <QDialog>
+
+#include "config.h"
+
+class QCheckBox;
+class QComboBox;
+class QLabel;
+class QLineEdit;
+class QPushButton;
+
+/// Names a query and keeps it in queries.json.
+///
+/// Pure UI: it is handed the config and returns a SavedQuery. It writes
+/// nothing, so it can be tested without touching a file, and the caller owns
+/// the decision of what to do with the result.
+class SaveQueryDialog : public QDialog
+{
+    Q_OBJECT
+public:
+    /// `query` is the text to store, `accountKey` the scope to preselect,
+    /// which is the account the user is already looking at.
+    SaveQueryDialog(const Config &config, const QString &query,
+                    const QString &accountKey, QWidget *parent = nullptr);
+
+    /// Edits an entry that already exists, prefilled from it rather than from
+    /// the query bar.
+    SaveQueryDialog(const Config &config, const SavedQuery &existing,
+                    QWidget *parent = nullptr);
+
+    /// The query as edited. Only meaningful after exec() returned Accepted.
+    SavedQuery savedQuery() const;
+
+    /// Whether `name` already names a stored query. Case-insensitive, matching
+    /// how startup_query resolves, so "inbox" and "Inbox" cannot both exist and
+    /// leave the user unable to tell which one a button ran.
+    static bool namesAnExistingQuery(const Config &config, const QString &name);
+
+private:
+    void build(const SavedQuery &initial);
+    void updateOkState();
+
+    /// The name the dialog was opened on, empty when creating. The caller
+    /// matches on this rather than on the returned name, so a rename replaces
+    /// the entry instead of adding a second one beside it.
+    QString m_originalName;
+
+    /// Set for a generated entry, whose query is composed from the accounts
+    /// and cannot be edited here.
+    QString m_generated;
+    bool m_flat = false;
+
+    const Config &m_config;
+    QLineEdit *m_name = nullptr;
+    QLineEdit *m_query = nullptr;
+    QComboBox *m_account = nullptr;
+    QCheckBox *m_pinned = nullptr;
+    QPushButton *m_ok = nullptr;
+    QLabel *m_notice = nullptr;
+};