Slow scrolling? [Ubuntu]

[dmoore]

I committed a one-liner that should take care of the problem efficiently. Doing Refresh(false) seems to be enough to reset the clip region, at least on windows.

[Alpha]

It works on Ubuntu as well (and the performance seems fine).

[dmoore]

Thanks for testing. I wonder if it is needed on Mac? The older, working code skipped the Refresh call for WXMAC. Perhaps we should do the same here.