[vtkusers] Mouse button release is still broken in 5.8.0 !

[EvilMax]

Hi, ALL!

I'm participating in building advanced medical visualization application in
Javausing VTK. I've worked with 5.6 and found annoying bug when left button
release event is not caused observer call. It forced to create a lots of
interaction workarounds where 'true' drag'n'drop required waiting for new
release. I've moved project to 5.8.0 successfully, but
LeftButtonReleaseEvent still uncatcheable.  I need help in tracking and
fixing this issue.

Here is some siagnostcs information. I've checked Java code (vtkPanel,
vtkCanvas etc...) and found in debug process that appropriate event handlers
are called. Issue is in ignoring vtkRenderWindowInteractor event calls. 
Here is sample code I've written and results:



Observer callbacks itself are here:


Here is output in console:



As you can see, release events are completely ignored.  And this prevents
implementation of any dran'n'drop code in Java project part. Of couse, we
can write some interactive code in C++, wrap it and attach to project. But
it is not always acceptable. 

Main question: how to fix this issue?

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