Code cleanup && speed up initial sync.

qml/component/MessageContextMenu.qml

@@ -0,0 +1,33 @@
+import QtQuick 2.9
+import QtQuick.Controls 2.2
+
+Menu {
+    MenuItem {
+        text: "Copy"
+        onTriggered: matriqueController.copyToClipboard(plainText)
+    }
+    MenuItem {
+        text: "Copy Source"
+        onTriggered: matriqueController.copyToClipboard(toolTip)
+    }
+    MenuItem {
+        visible: isFile
+        height: visible ? undefined : 0
+        text: "Open Externally"
+        onTriggered: delegateLoader.item.downloadAndOpen()
+    }
+    MenuItem {
+        visible: isFile
+        height: visible ? undefined : 0
+        text: "Save As"
+        onTriggered: delegateLoader.item.saveFileAs()
+    }
+    MenuItem {
+        visible: sentByMe
+        height: visible ? undefined : 0
+        text: "Redact"
+        onTriggered: currentRoom.redactEvent(eventId)
+    }
+
+    Component.onCompleted: popup()
+}