Test case for #5912 - cloning of DateTimeSelectElement is corrupting state
Hotfix for #5912 as suggested by @MeKeyCool
Merge pull request #5913 from Ocramius/hotfix/issue-#5912-wrong-datetime-select-cloning

Hotfix for #5912: wrong datetime select form element cloning logic
Merge branch 'hotfix/5913'

Close #5913
Fixes #5912