Implement devtoool to show hidden timeline messages

src/timeline/CMakeLists.txt

@@ -8,6 +8,7 @@ qt_add_qml_module(timeline
     QML_FILES
         EventDelegate.qml
         TimelineDelegate.qml
+        HiddenDelegate.qml
         MessageDelegate.qml
         LoadingDelegate.qml
         ReadMarkerDelegate.qml

src/timeline/EventDelegate.qml

@@ -50,6 +50,17 @@ DelegateChooser {
 
     DelegateChoice {
         roleValue: DelegateType.Other
-        delegate: Item {}
+        delegate: Config.showAllEvents ? hiddenDelegate : emptyDelegate
+
+        Component {
+            id: hiddenDelegate
+            HiddenDelegate {
+                room: root.room
+            }
+        }
+        Component {
+            id: emptyDelegate
+            Item {}
+        }
     }
 }

src/timeline/HiddenDelegate.qml

@@ -0,0 +1,94 @@
+// SPDX-FileCopyrightText: 2024 James Graham <james.h.graham@protonmail.com>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+
+import QtQuick
+import QtQuick.Controls as QQC2
+import QtQuick.Layouts
+
+import org.kde.kirigami as Kirigami
+import org.kde.kirigamiaddons.components as KirigamiComponents
+
+import org.kde.neochat
+
+TimelineDelegate {
+    id: root
+
+    /**
+     * @brief The NeoChatRoom the delegate is being displayed in.
+     */
+    required property NeoChatRoom room
+
+    /**
+     * @brief The matrix ID of the message event.
+     */
+    required property string eventId
+
+    /**
+     * @brief The message author.
+     *
+     * This should consist of the following:
+     *  - id - The matrix ID of the author.
+     *  - isLocalUser - Whether the author is the local user.
+     *  - avatarSource - The mxc URL for the author's avatar in the current room.
+     *  - avatarMediaId - The media ID of the author's avatar.
+     *  - avatarUrl - The mxc URL for the author's avatar.
+     *  - displayName - The display name of the author.
+     *  - display - The name of the author.
+     *  - color - The color for the author.
+     *  - object - The Quotient::User object for the author.
+     *
+     * @sa Quotient::User
+     */
+    required property var author
+
+    contentItem: QQC2.Control {
+        id: contentControl
+        contentItem: RowLayout {
+            KirigamiComponents.Avatar {
+                Layout.leftMargin: Kirigami.Units.largeSpacing * 1.5
+                implicitWidth: Kirigami.Units.iconSizes.small
+                implicitHeight: Kirigami.Units.iconSizes.small
+
+                name: root.author.displayName
+                source: root.author.avatarSource
+                color: root.author.color
+            }
+            QQC2.Label {
+                text: root.author.displayName + " : " + root.eventId
+                color: Kirigami.Theme.disabledTextColor
+                verticalAlignment: Text.AlignVCenter
+            }
+            Kirigami.Icon {
+                implicitWidth: Kirigami.Units.iconSizes.small
+                implicitHeight: Kirigami.Units.iconSizes.small
+                source: "view-hidden"
+            }
+        }
+
+        TapHandler {
+            acceptedButtons: Qt.RightButton
+            onTapped: _private.showMessageMenu()
+        }
+
+        TapHandler {
+            acceptedButtons: Qt.LeftButton
+            onLongPressed: _private.showMessageMenu()
+        }
+
+        background: Rectangle {
+            color: Kirigami.Theme.backgroundColor
+            radius: Kirigami.Units.smallSpacing
+            border {
+                width: contentControl.hovered ? 1 : 0
+                color: Kirigami.Theme.highlightColor
+            }
+        }
+    }
+
+    QtObject {
+        id: _private
+        function showMessageMenu() {
+            RoomManager.viewEventMenu(root.eventId, root.room, "");
+        }
+    }
+}