TYPO3 Core

The link wizward popup does not accept typolinks (e.g. external urls) larger than 300 chars.
After 300 characters the string is cut off.

Reproduce:

• Create a new content element of type "headline"
• Add an link to the "header link" with the typolink wizard popup
• "Set Link" Button in the Wizard and the popup will close
• Save the new content element and edit again
• Click on the typolink wizard button
• The wizard popup will open
• Click "Set link"
• The link in the input field for the "header link" is cut off.

Link with more than 300 chars

https://forger.typo3.com/gerrit/status?filters%5Bupdated_on%5D%5B1496275200000%5D=true&filters%5Bupdated_on%5D%5B1517443200000%5D=true&filters%5Bupdated_on%5D%5B1519862400000%5D=true&filters%5Bupdated_on%5D%5B1522540800000%5D=true&filters%5Bupdated_on%5D%5B1525132800000%5D=true&filters%5Bupdated_on%5D%5B1527811200000%5D=true&filters%5Bmergeable%5D%5Byes%5D=true&filters%5Baffected_files%5D%5B1%5D=true&filters%5Baffected_files%5D%5B12%5D=true&filters%5Baffected_files%5D%5B7%5D=true&filters%5Baffected_files%5D%5B10%5D=true&filters%5Btopic%5D%5B19483%5D=true&filters%5Btopic%5D%5B52046%5D=true&filters%5Btopic%5D%5BEXT%3A_extbase%5D=true&filters%5Btopic%5D%5BExtbase%5D=true&filters%5Btopic%5D%5Bissues%2F78450%5D=true&filters%5Bpatchsets%5D%5B1%5D=true&filters%5Bpatchsets%5D%5B2%5D=true

• typo3/cms/typo3/sysext/backend/Classes/Form/Element/AbstractFormElement.php:553
• typo3/cms/typo3/sysext/backend/Classes/Form/FieldControl/EditPopup.php:73
• typo3/cms/typo3/sysext/backend/Classes/Form/FieldControl/LinkPopup.php:73

The value should be configurable or raised to 1024 chars.