Questions inside a panel are divided between different pages in question-per-page mode

[SamMousa]

Describe the bug
Before the big rework questions inside a panel were always shown on the same page. Since the rework they no longer are.

Steps to reproduce
https://surveyjs.io/published?id=70a80007-8ca6-4d68-99cd-c25564b365d5

{
  "title": "panel bug",
  "logoPosition": "right",
  "pages": [
    {
      "name": "page1",
      "elements": [
        {
          "type": "panel",
          "name": "panel1",
          "elements": [
            {
              "type": "checkbox",
              "name": "V003a",
              "choices": [
                "1",
                "2",
                "3"
              ]
            },
            {
              "type": "checkbox",
              "name": "V003b",
              "choices": [
                "1",
                "2",
                "3"
              ]
            }
          ]
        }
      ]
    }
  ],
  "questionsOnPageMode": "questionPerPage"
}

Expected behavior
Panels are often used to create a kind of "composite" questions, it makes no sense to split them across multiple pages. Furthermore this is an undocumented (and I expect unintentional) change of behavior

[JaneSjs]

Hi @SamMousa,
Thank you for sharing this demo survey.

{
  "title": "panel bug",
  "logoPosition": "right",
  "pages": [
    {
      "name": "page1",
      "elements": [
        {
          "type": "panel",
          "name": "panel1",
          "elements": [
            {
              "type": "checkbox",
              "name": "V003a",
              "choices": [
                "1",
                "2",
                "3"
              ]
            },
            {
              "type": "checkbox",
              "name": "V003b",
              "choices": [
                "1",
                "2",
                "3"
              ]
            }
          ]
        }
      ]
    }
  ],
  "questionsOnPageMode": "questionPerPage"
}

From what I gather, even though you enable the questionsPerPage mode, you expect that panel questions appear within the same panel rather than on separate pages?

[SamMousa]

Correct, this used to be the behavior; and I also think it makes sense.

[andrewtelnov]

@SamMousa If we decide to work with a "panel" like with a "question" then it should be another mode, "elementPerPage".
We are working on another mode: "inputPerPage", where one input is per page. For example matrix with 3 columns and 4 rows will be displayed on 12 pages, one question cell per page.
It was requested a lot.
Do you really have this scenario with panels?

Thank you,
Andrew

[SamMousa]

For us this is the primary use case: questionPerPage where matrix and panel etc are NOT split. We are currently unable to upgrade because this feature was broken / changed.

I'm open to the arguments for the change, but it really isn't a minor change when the behaviour of all our surveys change 😅

[andrewtelnov]

@SamMousa That is true. I will take a look and see what we can do here. If there will be not many changes we could implement this functionality in a week or two.
I will be back. I need to try it to see how many code has to be changed.

Thank you,
Andrew

[SamMousa]

If it cannot be resolved we will not be able to upgrade, which means we'll have to fork (and we do not have the resources or required skills for that) so I really hope you find a solution!

Thanks for your efforts

[andrewtelnov]

@SamMousa We decided to revert the previous behavior. We will may add an option if somebody complains.
We will have to add just couple lines of code to make it optional, but for now decided do not do it.

Thank you,
Andrew