feature request

[kibkib]

Hello,
this is a very usefull tool that helps me to locate the position of a defective pixel on the LCD panel.

It would be nice to have following features too:
-display the physical position of a top left corner of the floating window (I can move the window to the defective pixel and it keeps there even if I move the mouse later, so i can make a screenshot)
-precise movement (1px) of the floating window using the cursor keys (it is difficult to move it precisely with the mouse)
-option to log physical position of a top left corner instead of a mouse position

Thank you!