Disallow scheduler on locked pages (if scheduler module is enabled)

[mgurjanov]

Issue

Locked pages can be unpublished by setting scheduler on a locked page.

Todo

We should check on locked pages if scheduler is set and show a form error thus preventing locked page to become potentially unpublished.

[sonvir249]

@mgurjanov Can you please provide some context of locked pages? Maybe I can work on this issue. Thanks!

[mgurjanov]

@sonvir249 Hi. Thanks for being active on this project!

We've implemented locked pages feature that is using config_pages module for setting nodes that should be locked from UI. So basically on a LIVE site you go to admin/structure/config_pages and I think within main settings you chose which nodes (landing pages) you want to be locked. Once configured those nodes are not supposed to be deleted by mistake or unpublished etc. This is useful for locking e.g. a site homepage.

This issue needs to cover locked pages feature in relationship to scheduler.

Initial PR for reference: #361 but there were other follow-up PRs.

If in doubt about anything else please let me know.

[sonvir249]

@mgurjanov Thank you so much for the detailed information. I have raised a draft PR. Most of the things are done, just form error part is remaining. Would you mind taking a look at the draft PR 754 ?

[amitaibu]

Re-opened since #754 caused main's tests to fail