[JAL-3226] problem that JavaScript (or Java) may consolidate multiple

[JAL-3226] problem that JavaScript (or Java) may consolidate multiple
repaint() requests in unpredictable ways. In this case, the issue was
that in response to a CTRL-C/CTRL-V paste request, in Java a fast
repaint request preceded two full requests, thus resulting
in a full request for paint. In constrast, in JavaScript, the three
requests were bundled together into one, so the fastPaint flag was
still present for the second and third request.

This resulted in incomplete painting.

The solution was to set seqCanvas.fastPaint and idCanvas.fastPaint false
in PaintRefresher when the target to be painted is one of those two
components.

BH 2019.04.22