Make mouse pointer in the center of the dialog

[Davider]

@Kevin

Thank you for your help,
It's not happening yet, red text
 
Change the trigger to  #M
When the middle mouse button is pressed at the edge of the screen, it needs to be processed, and the mouse pointer is located in the center of the dialog box 

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When I press the middle button of the mouse at the edge of the screen, A dialog box is displayed, and the pointer of the mouse should be in the center of the dialog box