Show confirmation dialog when leaving a room via the context menu

resources/qml/RoomList.qml

@@ -61,9 +61,19 @@ Page {
                 }
             }
 
+            Platform.MessageDialog {
+                id: leaveRoomDialog
+
+                title: qsTr("Leave Room")
+                text: qsTr("Are you sure you want to leave this room?")
+                modality: Qt.Modal
+                onAccepted: Rooms.leave(roomContextMenu.roomid)
+                buttons: Dialog.Ok | Dialog.Cancel
+            }
+
             Platform.MenuItem {
                 text: qsTr("Leave room")
-                onTriggered: Rooms.leave(roomContextMenu.roomid)
+                onTriggered: leaveRoomDialog.open()
             }
 
             Platform.MenuSeparator {

resources/qml/RoomSettings.qml

@@ -219,7 +219,7 @@ ApplicationWindow {
                 title: qsTr("End-to-End Encryption")
                 text: qsTr("Encryption is currently experimental and things might break unexpectedly. <br>
                             Please take note that it can't be disabled afterwards.")
-                modality: Qt.NonModal
+                modality: Qt.Modal
                 onAccepted: {
                     if (roomSettings.isEncryptionEnabled)
                         return ;