Webkit: An inline style cannot be applied on a collapsed selection

[Tobiasz Cudnik]

In Chrome, an inline style cannot be applied on a collapsed selection.

1. Open the editor with an empty document.
2. Select some style (a bold, marker or font family).
3. Type some text.

Expected: The new text has the style applied.

Result: The new text has a default style.

Looks much like #6004, but this is not a regression.

[Tobiasz Cudnik]

DUP of #1272.