QSpacerItem constructor arguments

[mcosta]

use

QSpacerItem(10, 10, QSizePolicy::Minimum, QSizePolicy::Expanding);

QSpacerItem(10, 10, QSizePolicy::Minimum, QSizePolicy::Expanding);

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w and h parameters are preferred dimension. Using QSizePolicy::Expanding for vertical size policy you can obtain what you want.