On the "Manage form display" of a node for example, if you change the order of fields, a warning message "You have unsaved changes." is displayed.
However, if you change the widget type or the widget configuration (clicking the gear to edit a textfield size for example), no message is displayed even if the configuration is actually not saved. Simply refresh the page and you will see the values being reverted.

screenshot

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Screen Shot 2017-03-24 at 11.11.08.png54.23 KBvbouchet
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vbouchet created an issue. See original summary.

Version: 8.2.x-dev » 8.9.x-dev

Drupal 8.8.7 was released on June 3, 2020 and is the final full bugfix release for the Drupal 8.8.x series. Branches prior to 8.8.x are not supported, and Drupal 8.8.x will not receive any further development aside from security fixes. Sites should prepare to update to Drupal 8.9.0 or Drupal 9.0.0 for ongoing support.

Bug reports should be targeted against the 8.9.x-dev branch from now on, and new development or disruptive changes should be targeted against the 9.1.x-dev branch. For more information see the Drupal 8 and 9 minor version schedule and the Allowed changes during the Drupal 8 and 9 release cycles.

pameeela’s picture

pameeela CreditAttribution: pameeela commented
Status: Active » Closed (duplicate)
Issue tags: +Bug Smash Initiative
Related issues: +#857312: Add a "changes not applied until saved" warning when changing widget/formatter settings

Thanks for reporting, this is a duplicate of #857312: Add a "changes not applied until saved" warning when changing widget/formatter settings