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Useful Fix for those Porting VSTGUI based plug-ins to AU

Fellow intrepid porters:

The problem of controls in VSTGUI-based plugins 'running away' in some hosts (In my case this behavior was manifesting itself in DP 4.1 when another window with animation (e.g. the performance meter) was open) is caused by the following code in vstgui.cpp:1946:

void CDrawContext::getMouseLocation (CPoint &point)
{
... other platform switches omitted
#elif MAC
Point where;
GetMouse (&where);
point (where.h, where.v);
#elif MOTIF

...

}

Which should be

Point where;
CGrafPtr save;
GetPort(&save);
SetPort(getPort());
GetMouse (&where);
point (where.h, where.v);
SetPort(save);

Hope that saves someone else an hour or so of debugging :) Also, I no longer subscribe to vst-development, so if anyone has the inclination to post this there...

Best,

Art
>>0xBA
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