Message Content Rework

For now everything should look identical. However this moves to using a model for the content of the message and is intended to lay the foundation for improved message content representation, e.g. splitting up a text message in multiple sections and using different delegates for things like code and quotes.

src/qml/EncryptedComponent.qml

@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: 2021 Tobias Fella <tobias.fella@kde.org>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+import QtQuick
+import QtQuick.Layouts
+
+import org.kde.kirigami as Kirigami
+
+/**
+ * @brief A component for an encrypted message that can't be decrypted.
+ */
+TextEdit {
+    /**
+     * @brief The maximum width that the bubble's content can be.
+     */
+    property real maxContentWidth: -1
+
+    Layout.fillWidth: true
+    Layout.maximumWidth: root.maxContentWidth
+
+    text: i18n("This message is encrypted and the sender has not shared the key with this device.")
+    color: Kirigami.Theme.disabledTextColor
+    selectedTextColor: Kirigami.Theme.highlightedTextColor
+    selectionColor: Kirigami.Theme.highlightColor
+    font.pointSize: Kirigami.Theme.defaultFont.pointSize
+    selectByMouse: !Kirigami.Settings.isMobile
+    readOnly: true
+    wrapMode: Text.WordWrap
+    textFormat: Text.RichText
+}