Why do widget flicker when Closing a popup window?

[LISP]

first : A Widget->show() and setGeometry(0, 0, this->width(), this->height())
second : B Widget->show() and setGeometry(0, 0, this->width(), this->height())

The two widgets overlap each other.

I closed widget B first.

I closed widget B first. At this time, the Titlebar of A Widget blinks....

I want to have a common Titlebar in multiple widgets, and I want to achieve a natural screen transition.

[LISP]

Thank you!
I solved the problem.
setUpdatesEnabled.
I used the setUpdatesEnabled property.

[JonB]

@LISP said in Why do widget flicker when Closing a popup window?:

I closed widget B first. At this time, the Titlebar of A Widget blinks....

Is that maybe because widget A becomes activated?

I want to have a common Titlebar in multiple widgets,

I don't think any windowing system/window manager offers a single "common Titlebar" which somehow appears in one place and is shared across widgets.

and I want to achieve a natural screen transition.

I don't know what that means.

[LISP]

Thank you!
I solved the problem.
setUpdatesEnabled.
I used the setUpdatesEnabled property.