<AWT Dev> Fix for DeltaAccumulator

[Sergey Malenkov]

Hello Alexander,

I want to suggest a change for your fix. It fixes the following issue:
http://youtrack.jetbrains.com/issue/IDEA-162490

My change updates processing of scrolling phase.
We should process events from PHASE_BEGIN to PHASE_END,
and ignore other events like PHASE_MAY_BEGIN.

Could you please review attached webrev.zip ?

-- 
Best regards,
Sergey A. Malenkov
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