Ask for confirmation before activating encryption in a room

src/qml/Dialog/ConfirmEncryptionDialog.qml

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+// SPDX-FileCopyrightText: 2022 Carl Schwan <carl@carlschwan.eu>
+// SPDX-FileCopyrightText: 2022 Tobias Fella <fella@posteo.de>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+import QtQuick 2.15
+import QtQuick.Controls 2.15 as QQC2
+import QtQuick.Layouts 1.15
+import org.kde.kirigami 2.15 as Kirigami
+
+QQC2.Dialog {
+    id: confirmEncryptionDialog
+
+    property var room
+
+    ColumnLayout {
+        Kirigami.Heading {
+            text: i18n("Activate Encryption")
+        }
+        QQC2.Label {
+            text: i18n("It will not be possible to deactivate the encryption after it is enabled.")
+        }
+    }
+
+    x: Math.round((parent.width - width) / 2)
+    y: Math.round((parent.height - height) / 2)
+    modal: true
+
+    footer: QQC2.DialogButtonBox {
+        QQC2.Button {
+            text: i18n("Cancel")
+            QQC2.DialogButtonBox.buttonRole: QQC2.DialogButtonBox.RejectRole
+            onClicked: confirmEncryptionDialog.close()
+        }
+
+        QQC2.Button {
+            text: i18n("Activate Encryption")
+            QQC2.DialogButtonBox.buttonRole: QQC2.DialogButtonBox.AcceptRole
+            onClicked: {
+                confirmEncryptionDialog.room.activateEncryption()
+                confirmEncryptionDialog.close();
+            }
+        }
+    }
+}