Hi,

I found a case where a Popup is not resized properly.

Here is the steps to reproduce this bug :

• you need at least a Window and a Popup.
• setup the Popup so its implicit height is greater than the Window's height.
• implement and fire a small routine that reduces the implicit height of the Popup.
• the Popup should not resize its height.
• however, if you resize the window after that, the Popup will resize.

If the Popup is not clamped by the window, everything is fine.

ComboBox and its internal Popup seem to be unaffected.

I attached a small qml file that demonstrates both cases. It requires Qt 5.15.

Thank you !