Displayed active style is incomplete

[anrikun]

When defining these styles:

  {name: 'P', element: 'p'},
  {name: 'P + myclass', element: 'p', attributes: {'class': 'myclass'}}

Selecting P + myclass from styles combo box works as expected. But the displayed active style is "P" instead of "P + myclass".

[anrikun]

Actually, I've just discovered a workaround by writing:

  {name: 'P', element: 'p', attributes: {'class': ''}},
  {name: 'P + myclass', element: 'p', attributes: {'class': 'myclass'}}

This should be documented.

[Sa'ar Zac Elias]

Dup of #6948.