Why
Passing 0 as the width to `CGUIText` meant "no wrapping".
Buttons and text objects therefore treated every caption as a
single unbroken line, ignoring embedded new-line characters and
overflowing their allotted space.
What
`GetPreferredTextSize` in both `CButton` and `CText` now forwards
`m_pGUI.GetWindowSize().Width` instead of 0.
With a real width the underlying `CGUIText::GetSize()` can measure
the caption using normal word-wrap rules, restoring correct
multi-line behaviour and preventing layout glitches.
Fixes: #8193
trompetin17
4fd3533f37