Qt无框透明窗口中的文本碎片

I'm trying to create a frameless transparent window with Qt and its go-bind(https://github.com/therecipe/qt).

The problem I have faced is that the debris of the text remains in the frameless transparent window. Please look at Gif(https://i.imgur.com/47OC7ps.gif).

The characteristics of the problem I confirmed are the following.

• Problems only occur in resized windows. (But not 100%)
• Only the text initially displayed in the window will remain as debris.

This problem can be avoided by explicitly calling Hide(), Show() in QMainWindow itself, but performance problems occur.

I expect that there will be some consideration for resizing the application since the problem occurs only in resized window.

Are there any ideas?

My environment is the following:

• Qt: 5.12.0
• My app source code: https://github.com/akiyosi/goqtframelesswindow commit:8d7aa6e

I solved this problem.

This problem is caused by the shadow of the window in MacOS. I was able to work around this issue by setting Qt::NoDropShadowWindowHint to the window.

Perhaps this problem is a bug of MacOS/Qt.