Declare zoom as a method because it's never used as a slot.
Declare updatePixmap as a method because it's used as a slot
as pointer-to-member-function, so it doesn't need help from moc.
Q_OBJECT is not needed anymore as the MandelbrotWidget class
doesn't contain signals ans slots anymore. It's replaced by
Q_DECLARE_TR_FUNCTIONS because we are using tr() function.
Fixes: QTBUG-108861
Change-Id: I9a1d66711cdc9f0ca5a1bc6645f7e0ed3395645c
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
(cherry picked from commit 2a2275756b31ae870b5735aecb21a6e8f4c6bd55)
66e35b71da