correct mustache rendering from causing mutation of initial dialog script

[InnoraG]

prevent mustache.render or parseTemplatesRecursive to mutate back line objects through copying to outgoing by value instead of reference using deepcopy format JSON.parse(JSON.stringify(line.xxxxx)) of objets like attachments, quick_replies or blocks

[InnoraG]

Adding example for better clarity :
In a sample multilang bot using mustache variable as template for translation, without deepcopy, the mustache template variable gets rendered permanently and disappear in "line" variable preventing rendering it over again

Sample rendering without deepcopy (QR text is fixed as initial value) :

Sample rendering with deepcopy (QR text can be translated using mustache in each turn) :

[adantoscano]

I tried with the following code

        let replies = new BotkitConversation('replies', controller);
        replies.ask({
            text: 'Click one of these suggestions!',
            quick_replies: [
                {
                    title: 'Foo',
                    payload: 'foo',
                },
                {
                    title: 'Bar',
                    payload: 'bar',
                }
            ]
        }, [], 'reply');
        replies.say({
            channelData: {
            attachment: {
              type: 'template',
              payload: {
                template_type: 'generic',
                elements: [
                  {
                    title: '{{vars.reply}}',
                    subtitle: '{{vars.reply}}',
                    image_url: `https://image.com`,
                    buttons: [
                      {
                        type: 'web_url',
                        url: 'https://google.com',
                        title: '{{vars.reply}}'
                      }
                    ]
                  }
                ]
              }
            }
        }});
        controller.addDialog(replies);

        controller.hears('qqq', 'message', async(bot, message) => {
            await bot.beginDialog('replies');
        });

Running twice, without changes, results in the same card clicking on diferent quick replies each time.

With @InnoraG changes running as expected!

[benbrown]

Thank you!!