Flashing sidebar after reparse?

My plugin (BashSupport) has a strange behaviour with IntelliJ 12.

Editing a bash file triggers a reparse (good so far). But shortly after the sidebar (where the bookmark icons, psi element icons etc are located) is
hidden for a short time and then displayed again.

A user made a short screen recording of it:http://bashsupport.googlecode.com/issues/attachment?aid=780000000&name=editor_jumps.mp4&token=tCedY6LhXpnvN-1DodOqYULFFlU%3A1355247344125
(issue url is http://code.google.com/p/bashsupport/issues/detail?id=78)

Is there a way to avoid this?

It worked fine in IntelliJ 11 with the same data which causes the behaviour in version 12.

Thanks a lot for any hints!

Wallaby