TYPO3 Core

If a backend field for inserting an image is configured like

<maxitems>1</maxitems>
<minitems>1</minitems>

the button to add a new relation is hidden by inline style "display:none". (Which is correct)

But if the image is deleted by using the trashcan icon, the upload button does not show up again.

This leads to the following behaviour:

• Its not possible to save the form (validation says there must be at least one image)
• Its not possible to add another image and therefore make the form valid because of the missing upload button

The Buttons are hidden in typo3/sysext/backend/Classes/Form/Container/InlineControlContainer.php:247

In https://forge.typo3.org/issues/45125 is stated that:
"The buttons are not immediately
hidden/shown if the number of relation changes. That would involve
JavaScript magic and could be done in a follow up."

That Javascript seems to be not implemented yet.

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Steps to reproduce:

• Create a flexform including an inline field for inserting an image.
  Set
  

  <maxitems>1</maxitems>
  <minitems>1</minitems>
  

• Upload one image and save the form
• The upload button is hidden
• Delete the uploaded image using the trashcan icon
• The upload button does not show up again