Some formatting options not working on inline widgets

[Tsvetelin Novkirishki]

Descriptive summary: Underline and Strike through are not working when applied on an inline widget. By CSS specs, the underline does not affect inline blocks (.cke_widget_inline is inline-block) inside the element for which text-decoration: underline or line-through has been set. Partial solution is to make CSS selector like:

s .cke_widget_inline
{
  text-decoration: underline;
}

It's partial, because the user cannot do both underline and strike through at the same time.

Steps to reproduce:

1. Insert some inline widget
2. Underline it and you'll see nothing will happen
3. Take a not at the path - it shows the U tag, but it's not visible to the user

Browser and OS: Chrome and Firefox under both Windows and Linux