Undefined reference to QWidget::event(QKeyEvent *) in custom classes

[d_stranz]

Seems like I accidentally corrupted that file myself.

If I were you, I would re-install Qt instead of relying on your memory and hand-editing a really core Qt header file. Who knows what else you've "accidentally corrupted" that might come back to bite you later?

You are fortunate that you seem to be using a binary distribution of Qt, and the linker caught your error.