[MPlayer-dev-eng] [PATCH] GUI: Implement a true rotary potmeter

[Hans-Dieter Kosch]

The 'potmeter' currently responds only to horizontal mouse coordinates. This is 
especially confusing when the pot does not rotate in the expected direction 
depending on the quadrants of pot and mouse positions.

Attached patch implements a true rotary pot. You can click on an angular 
position and rotate by circular mouse movement. And it has stop points like its 
mechanical counterpart.

Tested with the volume pot of default skin 'Blue'.

The patch is quite big due to the code redundancy in the files. Perhaps 
outsourcing and reusing common code?

Hans-Dieter
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