Calculator Example - Double clicking on the window's frame causes it to jump to the left top of the screen

Description:

Double clicking on the window's frame cause the window to jump to the left top corner of the screen.
Steps to reproduce:

Open the Calculator Example

Double click on his window frame (it is now in the top left corner){}

Expected behavior:

Double clicking on the window's frame should not have any effect.
Observed behavior:

Double clicking on the window's frame makes the window jump to the top left corner of the screen.
Special Rules:

This might be a functionality made on purpose.*