"View source" dialog.

qml/form/RoomForm.qml

@@ -1,13 +1,13 @@
 import QtQuick 2.9
 import QtQuick.Controls 2.2
-import QtQuick.Dialogs 1.2
 import QtQuick.Layouts 1.3
 import QtQuick.Controls.Material 2.2
 import QtGraphicalEffects 1.0
 import Matrique 0.1
 import Matrique.Settings 0.1
 
-import "../component"
+import "qrc:/qml/component"
+import "qrc:/qml/menu"
 import "qrc:/js/md.js" as Markdown
 import "qrc:/js/util.js" as Util
 
@@ -225,6 +225,36 @@ Item {
 
                         Behavior on opacity { NumberAnimation { duration: 200 } }
                     }
+
+                    MessageContextMenu { id: messageContextMenu }
+
+                    Dialog {
+                        property string sourceText
+
+                        x: (window.width - width) / 2
+                        y: (window.height - height) / 2
+                        width: 480
+
+                        id: sourceDialog
+
+                        parent: ApplicationWindow.overlay
+
+                        modal: true
+                        standardButtons: Dialog.Ok
+
+                        padding: 16
+
+                        title: "View Source"
+
+                        contentItem: ScrollView {
+                            TextArea {
+                                readOnly: true
+                                selectByMouse: true
+
+                                text: sourceDialog.sourceText
+                            }
+                        }
+                    }
                 }
 
                 ScrollBar {