If a button was created using a normal single-line label (including empty one) and then its label was changed to something multi-line later, its size stayed wrong in wxOSX as it still used the fixed size bezel used by normal buttons. Adjust the bezel after each bezel change now to update the size of the button if necessary. Closes #12491. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72886 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775