3D Mouse rotate broken for fltk backend

[Benjamin Lindner]

Hello list,

I brought this up already once, but no one replied, so I'd like to
ping the issue again.
With a 3-4-0 tag build of octave on mingw platform, mouse rotation on
a 3D plot using the fltk backend does not work.
testing as:

graphics_toolkit('fltk');
sombrero(40);

Then clicking on the "R" button.
The strange behaviour is, that the rotation is done in the background,
and the first few events of mouse movement are registered, but then
the display does not change until I force a redraw by minimizing & and
restoring the plotting window.

Is this a manifestation of the already mentioned race condition with fltk?
Or is it a different bug?

benjamin