[ardour-dev] [patch] automation line display fixes

[gerard van dongen]

Included patch fixes the problems mentioned earlier in the list for  
automation lines hiding too many points at large zoom.
(or is that small zoom, anyway when a pixel represents a lot of audio  
frames)

As a side benefit, I think it also fixes an unknown bug :)
Horizontal constrained dragging an automation point would round its place  
to the screen resolution, instead of keeping it really at its place in  
time. That could easily cause jumps in position of a second or longer - in  
a long session zoomed out all the way.

as it is with these thing, no garantee, YMMV etc etc

regards

Gerard
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