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Type: Bug
Resolution: Fixed
Priority: P1: Critical
Fix Version/s: 6.8.1, 6.8.2, 6.9.0 FF
Affects Version/s: 6.8.0
Component/s: Widgets: Widgets and Dialogs
Labels:
None

Platform/s:

Windows
Commits:
1731d8af7 (dev), 4a27d0fe0 (6.8), deadc8b1a (6.8.1)

Calling QWidget::childAt on a widget that has empty children (width or height is 0) can return said children. The following code triggers the assert in 6.8.0, but not in 6.7:

#include <QApplication>
#include <QWidget>
#include <cassert>

int main(int argc, char **argv) {
  QApplication app(argc, argv);

  QWidget parent(nullptr, Qt::FramelessWindowHint);
  parent.resize(200, 200);

  QWidget *emptyChild = new QWidget(&parent);
  emptyChild->setGeometry(0, 100, 200, 0);

  assert(parent.childAt(100, 100) == nullptr);
}